libjs-yui 2.8.2r1~squeeze-1 / usr / share / javascript / yui / calendar / calendar-debug.js

/*
Copyright (c) 2010, Yahoo! Inc. All rights reserved.
Code licensed under the BSD License:
http://developer.yahoo.com/yui/license.html
version: 2.8.2r1
*/
(function () {

    /**
    * Config is a utility used within an Object to allow the implementer to
    * maintain a list of local configuration properties and listen for changes 
    * to those properties dynamically using CustomEvent. The initial values are 
    * also maintained so that the configuration can be reset at any given point 
    * to its initial state.
    * @namespace YAHOO.util
    * @class Config
    * @constructor
    * @param {Object} owner The owner Object to which this Config Object belongs
    */
    YAHOO.util.Config = function (owner) {

        if (owner) {
            this.init(owner);
        }

        if (!owner) {  YAHOO.log("No owner specified for Config object", "error", "Config"); }

    };


    var Lang = YAHOO.lang,
        CustomEvent = YAHOO.util.CustomEvent,
        Config = YAHOO.util.Config;


    /**
     * Constant representing the CustomEvent type for the config changed event.
     * @property YAHOO.util.Config.CONFIG_CHANGED_EVENT
     * @private
     * @static
     * @final
     */
    Config.CONFIG_CHANGED_EVENT = "configChanged";
    
    /**
     * Constant representing the boolean type string
     * @property YAHOO.util.Config.BOOLEAN_TYPE
     * @private
     * @static
     * @final
     */
    Config.BOOLEAN_TYPE = "boolean";
    
    Config.prototype = {
     
        /**
        * Object reference to the owner of this Config Object
        * @property owner
        * @type Object
        */
        owner: null,
        
        /**
        * Boolean flag that specifies whether a queue is currently 
        * being executed
        * @property queueInProgress
        * @type Boolean
        */
        queueInProgress: false,
        
        /**
        * Maintains the local collection of configuration property objects and 
        * their specified values
        * @property config
        * @private
        * @type Object
        */ 
        config: null,
        
        /**
        * Maintains the local collection of configuration property objects as 
        * they were initially applied.
        * This object is used when resetting a property.
        * @property initialConfig
        * @private
        * @type Object
        */ 
        initialConfig: null,
        
        /**
        * Maintains the local, normalized CustomEvent queue
        * @property eventQueue
        * @private
        * @type Object
        */ 
        eventQueue: null,
        
        /**
        * Custom Event, notifying subscribers when Config properties are set 
        * (setProperty is called without the silent flag
        * @event configChangedEvent
        */
        configChangedEvent: null,
    
        /**
        * Initializes the configuration Object and all of its local members.
        * @method init
        * @param {Object} owner The owner Object to which this Config 
        * Object belongs
        */
        init: function (owner) {
    
            this.owner = owner;
    
            this.configChangedEvent = 
                this.createEvent(Config.CONFIG_CHANGED_EVENT);
    
            this.configChangedEvent.signature = CustomEvent.LIST;
            this.queueInProgress = false;
            this.config = {};
            this.initialConfig = {};
            this.eventQueue = [];
        
        },
        
        /**
        * Validates that the value passed in is a Boolean.
        * @method checkBoolean
        * @param {Object} val The value to validate
        * @return {Boolean} true, if the value is valid
        */ 
        checkBoolean: function (val) {
            return (typeof val == Config.BOOLEAN_TYPE);
        },
        
        /**
        * Validates that the value passed in is a number.
        * @method checkNumber
        * @param {Object} val The value to validate
        * @return {Boolean} true, if the value is valid
        */
        checkNumber: function (val) {
            return (!isNaN(val));
        },
        
        /**
        * Fires a configuration property event using the specified value. 
        * @method fireEvent
        * @private
        * @param {String} key The configuration property's name
        * @param {value} Object The value of the correct type for the property
        */ 
        fireEvent: function ( key, value ) {
            YAHOO.log("Firing Config event: " + key + "=" + value, "info", "Config");
            var property = this.config[key];
        
            if (property && property.event) {
                property.event.fire(value);
            } 
        },
        
        /**
        * Adds a property to the Config Object's private config hash.
        * @method addProperty
        * @param {String} key The configuration property's name
        * @param {Object} propertyObject The Object containing all of this 
        * property's arguments
        */
        addProperty: function ( key, propertyObject ) {
            key = key.toLowerCase();
            YAHOO.log("Added property: " + key, "info", "Config");
        
            this.config[key] = propertyObject;
        
            propertyObject.event = this.createEvent(key, { scope: this.owner });
            propertyObject.event.signature = CustomEvent.LIST;
            
            
            propertyObject.key = key;
        
            if (propertyObject.handler) {
                propertyObject.event.subscribe(propertyObject.handler, 
                    this.owner);
            }
        
            this.setProperty(key, propertyObject.value, true);
            
            if (! propertyObject.suppressEvent) {
                this.queueProperty(key, propertyObject.value);
            }
            
        },
        
        /**
        * Returns a key-value configuration map of the values currently set in  
        * the Config Object.
        * @method getConfig
        * @return {Object} The current config, represented in a key-value map
        */
        getConfig: function () {
        
            var cfg = {},
                currCfg = this.config,
                prop,
                property;
                
            for (prop in currCfg) {
                if (Lang.hasOwnProperty(currCfg, prop)) {
                    property = currCfg[prop];
                    if (property && property.event) {
                        cfg[prop] = property.value;
                    }
                }
            }

            return cfg;
        },
        
        /**
        * Returns the value of specified property.
        * @method getProperty
        * @param {String} key The name of the property
        * @return {Object}  The value of the specified property
        */
        getProperty: function (key) {
            var property = this.config[key.toLowerCase()];
            if (property && property.event) {
                return property.value;
            } else {
                return undefined;
            }
        },
        
        /**
        * Resets the specified property's value to its initial value.
        * @method resetProperty
        * @param {String} key The name of the property
        * @return {Boolean} True is the property was reset, false if not
        */
        resetProperty: function (key) {
    
            key = key.toLowerCase();
        
            var property = this.config[key];
    
            if (property && property.event) {
    
                if (this.initialConfig[key] && 
                    !Lang.isUndefined(this.initialConfig[key])) {
    
                    this.setProperty(key, this.initialConfig[key]);

                    return true;
    
                }
    
            } else {
    
                return false;
            }
    
        },
        
        /**
        * Sets the value of a property. If the silent property is passed as 
        * true, the property's event will not be fired.
        * @method setProperty
        * @param {String} key The name of the property
        * @param {String} value The value to set the property to
        * @param {Boolean} silent Whether the value should be set silently, 
        * without firing the property event.
        * @return {Boolean} True, if the set was successful, false if it failed.
        */
        setProperty: function (key, value, silent) {
        
            var property;
        
            key = key.toLowerCase();
            YAHOO.log("setProperty: " + key + "=" + value, "info", "Config");
        
            if (this.queueInProgress && ! silent) {
                // Currently running through a queue... 
                this.queueProperty(key,value);
                return true;
    
            } else {
                property = this.config[key];
                if (property && property.event) {
                    if (property.validator && !property.validator(value)) {
                        return false;
                    } else {
                        property.value = value;
                        if (! silent) {
                            this.fireEvent(key, value);
                            this.configChangedEvent.fire([key, value]);
                        }
                        return true;
                    }
                } else {
                    return false;
                }
            }
        },
        
        /**
        * Sets the value of a property and queues its event to execute. If the 
        * event is already scheduled to execute, it is
        * moved from its current position to the end of the queue.
        * @method queueProperty
        * @param {String} key The name of the property
        * @param {String} value The value to set the property to
        * @return {Boolean}  true, if the set was successful, false if 
        * it failed.
        */ 
        queueProperty: function (key, value) {
        
            key = key.toLowerCase();
            YAHOO.log("queueProperty: " + key + "=" + value, "info", "Config");
        
            var property = this.config[key],
                foundDuplicate = false,
                iLen,
                queueItem,
                queueItemKey,
                queueItemValue,
                sLen,
                supercedesCheck,
                qLen,
                queueItemCheck,
                queueItemCheckKey,
                queueItemCheckValue,
                i,
                s,
                q;
                                
            if (property && property.event) {
    
                if (!Lang.isUndefined(value) && property.validator && 
                    !property.validator(value)) { // validator
                    return false;
                } else {
        
                    if (!Lang.isUndefined(value)) {
                        property.value = value;
                    } else {
                        value = property.value;
                    }
        
                    foundDuplicate = false;
                    iLen = this.eventQueue.length;
        
                    for (i = 0; i < iLen; i++) {
                        queueItem = this.eventQueue[i];
        
                        if (queueItem) {
                            queueItemKey = queueItem[0];
                            queueItemValue = queueItem[1];

                            if (queueItemKey == key) {
    
                                /*
                                    found a dupe... push to end of queue, null 
                                    current item, and break
                                */
    
                                this.eventQueue[i] = null;
    
                                this.eventQueue.push(
                                    [key, (!Lang.isUndefined(value) ? 
                                    value : queueItemValue)]);
    
                                foundDuplicate = true;
                                break;
                            }
                        }
                    }
                    
                    // this is a refire, or a new property in the queue
    
                    if (! foundDuplicate && !Lang.isUndefined(value)) { 
                        this.eventQueue.push([key, value]);
                    }
                }
        
                if (property.supercedes) {

                    sLen = property.supercedes.length;

                    for (s = 0; s < sLen; s++) {

                        supercedesCheck = property.supercedes[s];
                        qLen = this.eventQueue.length;

                        for (q = 0; q < qLen; q++) {
                            queueItemCheck = this.eventQueue[q];

                            if (queueItemCheck) {
                                queueItemCheckKey = queueItemCheck[0];
                                queueItemCheckValue = queueItemCheck[1];

                                if (queueItemCheckKey == 
                                    supercedesCheck.toLowerCase() ) {

                                    this.eventQueue.push([queueItemCheckKey, 
                                        queueItemCheckValue]);

                                    this.eventQueue[q] = null;
                                    break;

                                }
                            }
                        }
                    }
                }

                YAHOO.log("Config event queue: " + this.outputEventQueue(), "info", "Config");

                return true;
            } else {
                return false;
            }
        },
        
        /**
        * Fires the event for a property using the property's current value.
        * @method refireEvent
        * @param {String} key The name of the property
        */
        refireEvent: function (key) {
    
            key = key.toLowerCase();
        
            var property = this.config[key];
    
            if (property && property.event && 
    
                !Lang.isUndefined(property.value)) {
    
                if (this.queueInProgress) {
    
                    this.queueProperty(key);
    
                } else {
    
                    this.fireEvent(key, property.value);
    
                }
    
            }
        },
        
        /**
        * Applies a key-value Object literal to the configuration, replacing  
        * any existing values, and queueing the property events.
        * Although the values will be set, fireQueue() must be called for their 
        * associated events to execute.
        * @method applyConfig
        * @param {Object} userConfig The configuration Object literal
        * @param {Boolean} init  When set to true, the initialConfig will 
        * be set to the userConfig passed in, so that calling a reset will 
        * reset the properties to the passed values.
        */
        applyConfig: function (userConfig, init) {
        
            var sKey,
                oConfig;

            if (init) {
                oConfig = {};
                for (sKey in userConfig) {
                    if (Lang.hasOwnProperty(userConfig, sKey)) {
                        oConfig[sKey.toLowerCase()] = userConfig[sKey];
                    }
                }
                this.initialConfig = oConfig;
            }

            for (sKey in userConfig) {
                if (Lang.hasOwnProperty(userConfig, sKey)) {
                    this.queueProperty(sKey, userConfig[sKey]);
                }
            }
        },
        
        /**
        * Refires the events for all configuration properties using their 
        * current values.
        * @method refresh
        */
        refresh: function () {

            var prop;

            for (prop in this.config) {
                if (Lang.hasOwnProperty(this.config, prop)) {
                    this.refireEvent(prop);
                }
            }
        },
        
        /**
        * Fires the normalized list of queued property change events
        * @method fireQueue
        */
        fireQueue: function () {
        
            var i, 
                queueItem,
                key,
                value,
                property;
        
            this.queueInProgress = true;
            for (i = 0;i < this.eventQueue.length; i++) {
                queueItem = this.eventQueue[i];
                if (queueItem) {
        
                    key = queueItem[0];
                    value = queueItem[1];
                    property = this.config[key];

                    property.value = value;

                    // Clear out queue entry, to avoid it being 
                    // re-added to the queue by any queueProperty/supercedes
                    // calls which are invoked during fireEvent
                    this.eventQueue[i] = null;

                    this.fireEvent(key,value);
                }
            }
            
            this.queueInProgress = false;
            this.eventQueue = [];
        },
        
        /**
        * Subscribes an external handler to the change event for any 
        * given property. 
        * @method subscribeToConfigEvent
        * @param {String} key The property name
        * @param {Function} handler The handler function to use subscribe to 
        * the property's event
        * @param {Object} obj The Object to use for scoping the event handler 
        * (see CustomEvent documentation)
        * @param {Boolean} overrideContext Optional. If true, will override
        * "this" within the handler to map to the scope Object passed into the
        * method.
        * @return {Boolean} True, if the subscription was successful, 
        * otherwise false.
        */ 
        subscribeToConfigEvent: function (key, handler, obj, overrideContext) {
    
            var property = this.config[key.toLowerCase()];
    
            if (property && property.event) {
                if (!Config.alreadySubscribed(property.event, handler, obj)) {
                    property.event.subscribe(handler, obj, overrideContext);
                }
                return true;
            } else {
                return false;
            }
    
        },
        
        /**
        * Unsubscribes an external handler from the change event for any 
        * given property. 
        * @method unsubscribeFromConfigEvent
        * @param {String} key The property name
        * @param {Function} handler The handler function to use subscribe to 
        * the property's event
        * @param {Object} obj The Object to use for scoping the event 
        * handler (see CustomEvent documentation)
        * @return {Boolean} True, if the unsubscription was successful, 
        * otherwise false.
        */
        unsubscribeFromConfigEvent: function (key, handler, obj) {
            var property = this.config[key.toLowerCase()];
            if (property && property.event) {
                return property.event.unsubscribe(handler, obj);
            } else {
                return false;
            }
        },
        
        /**
        * Returns a string representation of the Config object
        * @method toString
        * @return {String} The Config object in string format.
        */
        toString: function () {
            var output = "Config";
            if (this.owner) {
                output += " [" + this.owner.toString() + "]";
            }
            return output;
        },
        
        /**
        * Returns a string representation of the Config object's current 
        * CustomEvent queue
        * @method outputEventQueue
        * @return {String} The string list of CustomEvents currently queued 
        * for execution
        */
        outputEventQueue: function () {

            var output = "",
                queueItem,
                q,
                nQueue = this.eventQueue.length;
              
            for (q = 0; q < nQueue; q++) {
                queueItem = this.eventQueue[q];
                if (queueItem) {
                    output += queueItem[0] + "=" + queueItem[1] + ", ";
                }
            }
            return output;
        },

        /**
        * Sets all properties to null, unsubscribes all listeners from each 
        * property's change event and all listeners from the configChangedEvent.
        * @method destroy
        */
        destroy: function () {

            var oConfig = this.config,
                sProperty,
                oProperty;


            for (sProperty in oConfig) {
            
                if (Lang.hasOwnProperty(oConfig, sProperty)) {

                    oProperty = oConfig[sProperty];

                    oProperty.event.unsubscribeAll();
                    oProperty.event = null;

                }
            
            }
            
            this.configChangedEvent.unsubscribeAll();
            
            this.configChangedEvent = null;
            this.owner = null;
            this.config = null;
            this.initialConfig = null;
            this.eventQueue = null;
        
        }

    };
    
    
    
    /**
    * Checks to determine if a particular function/Object pair are already 
    * subscribed to the specified CustomEvent
    * @method YAHOO.util.Config.alreadySubscribed
    * @static
    * @param {YAHOO.util.CustomEvent} evt The CustomEvent for which to check 
    * the subscriptions
    * @param {Function} fn The function to look for in the subscribers list
    * @param {Object} obj The execution scope Object for the subscription
    * @return {Boolean} true, if the function/Object pair is already subscribed 
    * to the CustomEvent passed in
    */
    Config.alreadySubscribed = function (evt, fn, obj) {
    
        var nSubscribers = evt.subscribers.length,
            subsc,
            i;

        if (nSubscribers > 0) {
            i = nSubscribers - 1;
            do {
                subsc = evt.subscribers[i];
                if (subsc && subsc.obj == obj && subsc.fn == fn) {
                    return true;
                }
            }
            while (i--);
        }

        return false;

    };

    YAHOO.lang.augmentProto(Config, YAHOO.util.EventProvider);

}());
/**
* The datemath module provides utility methods for basic JavaScript Date object manipulation and 
* comparison. 
* 
* @module datemath
*/

/**
* YAHOO.widget.DateMath is used for simple date manipulation. The class is a static utility
* used for adding, subtracting, and comparing dates.
* @namespace YAHOO.widget
* @class DateMath
*/
YAHOO.widget.DateMath = {
    /**
    * Constant field representing Day
    * @property DAY
    * @static
    * @final
    * @type String
    */
    DAY : "D",

    /**
    * Constant field representing Week
    * @property WEEK
    * @static
    * @final
    * @type String
    */
    WEEK : "W",

    /**
    * Constant field representing Year
    * @property YEAR
    * @static
    * @final
    * @type String
    */
    YEAR : "Y",

    /**
    * Constant field representing Month
    * @property MONTH
    * @static
    * @final
    * @type String
    */
    MONTH : "M",

    /**
    * Constant field representing one day, in milliseconds
    * @property ONE_DAY_MS
    * @static
    * @final
    * @type Number
    */
    ONE_DAY_MS : 1000*60*60*24,
    
    /**
     * Constant field representing the date in first week of January
     * which identifies the first week of the year.
     * <p>
     * In the U.S, Jan 1st is normally used based on a Sunday start of week.
     * ISO 8601, used widely throughout Europe, uses Jan 4th, based on a Monday start of week.
     * </p>
     * @property WEEK_ONE_JAN_DATE
     * @static
     * @type Number
     */
    WEEK_ONE_JAN_DATE : 1,

    /**
    * Adds the specified amount of time to the this instance.
    * @method add
    * @param {Date} date The JavaScript Date object to perform addition on
    * @param {String} field The field constant to be used for performing addition.
    * @param {Number} amount The number of units (measured in the field constant) to add to the date.
    * @return {Date} The resulting Date object
    */
    add : function(date, field, amount) {
        var d = new Date(date.getTime());
        switch (field) {
            case this.MONTH:
                var newMonth = date.getMonth() + amount;
                var years = 0;

                if (newMonth < 0) {
                    while (newMonth < 0) {
                        newMonth += 12;
                        years -= 1;
                    }
                } else if (newMonth > 11) {
                    while (newMonth > 11) {
                        newMonth -= 12;
                        years += 1;
                    }
                }

                d.setMonth(newMonth);
                d.setFullYear(date.getFullYear() + years);
                break;
            case this.DAY:
                this._addDays(d, amount);
                // d.setDate(date.getDate() + amount);
                break;
            case this.YEAR:
                d.setFullYear(date.getFullYear() + amount);
                break;
            case this.WEEK:
                this._addDays(d, (amount * 7));
                // d.setDate(date.getDate() + (amount * 7));
                break;
        }
        return d;
    },

    /**
     * Private helper method to account for bug in Safari 2 (webkit < 420)
     * when Date.setDate(n) is called with n less than -128 or greater than 127.
     * <p>
     * Fix approach and original findings are available here:
     * http://brianary.blogspot.com/2006/03/safari-date-bug.html
     * </p>
     * @method _addDays
     * @param {Date} d JavaScript date object
     * @param {Number} nDays The number of days to add to the date object (can be negative)
     * @private
     */
    _addDays : function(d, nDays) {
        if (YAHOO.env.ua.webkit && YAHOO.env.ua.webkit < 420) {
            if (nDays < 0) {
                // Ensure we don't go below -128 (getDate() is always 1 to 31, so we won't go above 127)
                for(var min = -128; nDays < min; nDays -= min) {
                    d.setDate(d.getDate() + min);
                }
            } else {
                // Ensure we don't go above 96 + 31 = 127
                for(var max = 96; nDays > max; nDays -= max) {
                    d.setDate(d.getDate() + max);
                }
            }
            // nDays should be remainder between -128 and 96
        }
        d.setDate(d.getDate() + nDays);
    },

    /**
    * Subtracts the specified amount of time from the this instance.
    * @method subtract
    * @param {Date} date The JavaScript Date object to perform subtraction on
    * @param {Number} field The this field constant to be used for performing subtraction.
    * @param {Number} amount The number of units (measured in the field constant) to subtract from the date.
    * @return {Date} The resulting Date object
    */
    subtract : function(date, field, amount) {
        return this.add(date, field, (amount*-1));
    },

    /**
    * Determines whether a given date is before another date on the calendar.
    * @method before
    * @param {Date} date  The Date object to compare with the compare argument
    * @param {Date} compareTo The Date object to use for the comparison
    * @return {Boolean} true if the date occurs before the compared date; false if not.
    */
    before : function(date, compareTo) {
        var ms = compareTo.getTime();
        if (date.getTime() < ms) {
            return true;
        } else {
            return false;
        }
    },

    /**
    * Determines whether a given date is after another date on the calendar.
    * @method after
    * @param {Date} date  The Date object to compare with the compare argument
    * @param {Date} compareTo The Date object to use for the comparison
    * @return {Boolean} true if the date occurs after the compared date; false if not.
    */
    after : function(date, compareTo) {
        var ms = compareTo.getTime();
        if (date.getTime() > ms) {
            return true;
        } else {
            return false;
        }
    },

    /**
    * Determines whether a given date is between two other dates on the calendar.
    * @method between
    * @param {Date} date  The date to check for
    * @param {Date} dateBegin The start of the range
    * @param {Date} dateEnd  The end of the range
    * @return {Boolean} true if the date occurs between the compared dates; false if not.
    */
    between : function(date, dateBegin, dateEnd) {
        if (this.after(date, dateBegin) && this.before(date, dateEnd)) {
            return true;
        } else {
            return false;
        }
    },
    
    /**
    * Retrieves a JavaScript Date object representing January 1 of any given year.
    * @method getJan1
    * @param {Number} calendarYear  The calendar year for which to retrieve January 1
    * @return {Date} January 1 of the calendar year specified.
    */
    getJan1 : function(calendarYear) {
        return this.getDate(calendarYear,0,1);
    },

    /**
    * Calculates the number of days the specified date is from January 1 of the specified calendar year.
    * Passing January 1 to this function would return an offset value of zero.
    * @method getDayOffset
    * @param {Date} date The JavaScript date for which to find the offset
    * @param {Number} calendarYear The calendar year to use for determining the offset
    * @return {Number} The number of days since January 1 of the given year
    */
    getDayOffset : function(date, calendarYear) {
        var beginYear = this.getJan1(calendarYear); // Find the start of the year. This will be in week 1.
        
        // Find the number of days the passed in date is away from the calendar year start
        var dayOffset = Math.ceil((date.getTime()-beginYear.getTime()) / this.ONE_DAY_MS);
        return dayOffset;
    },

    /**
    * Calculates the week number for the given date. Can currently support standard
    * U.S. week numbers, based on Jan 1st defining the 1st week of the year, and 
    * ISO8601 week numbers, based on Jan 4th defining the 1st week of the year.
    * 
    * @method getWeekNumber
    * @param {Date} date The JavaScript date for which to find the week number
    * @param {Number} firstDayOfWeek The index of the first day of the week (0 = Sun, 1 = Mon ... 6 = Sat).
    * Defaults to 0
    * @param {Number} janDate The date in the first week of January which defines week one for the year
    * Defaults to the value of YAHOO.widget.DateMath.WEEK_ONE_JAN_DATE, which is 1 (Jan 1st). 
    * For the U.S, this is normally Jan 1st. ISO8601 uses Jan 4th to define the first week of the year.
    * 
    * @return {Number} The number of the week containing the given date.
    */
    getWeekNumber : function(date, firstDayOfWeek, janDate) {

        // Setup Defaults
        firstDayOfWeek = firstDayOfWeek || 0;
        janDate = janDate || this.WEEK_ONE_JAN_DATE;

        var targetDate = this.clearTime(date),
            startOfWeek,
            endOfWeek;

        if (targetDate.getDay() === firstDayOfWeek) { 
            startOfWeek = targetDate;
        } else {
            startOfWeek = this.getFirstDayOfWeek(targetDate, firstDayOfWeek);
        }

        var startYear = startOfWeek.getFullYear();

        // DST shouldn't be a problem here, math is quicker than setDate();
        endOfWeek = new Date(startOfWeek.getTime() + 6*this.ONE_DAY_MS);

        var weekNum;
        if (startYear !== endOfWeek.getFullYear() && endOfWeek.getDate() >= janDate) {
            // If years don't match, endOfWeek is in Jan. and if the 
            // week has WEEK_ONE_JAN_DATE in it, it's week one by definition.
            weekNum = 1;
        } else {
            // Get the 1st day of the 1st week, and 
            // find how many days away we are from it.
            var weekOne = this.clearTime(this.getDate(startYear, 0, janDate)),
                weekOneDayOne = this.getFirstDayOfWeek(weekOne, firstDayOfWeek);

            // Round days to smoothen out 1 hr DST diff
            var daysDiff  = Math.round((targetDate.getTime() - weekOneDayOne.getTime())/this.ONE_DAY_MS);

            // Calc. Full Weeks
            var rem = daysDiff % 7;
            var weeksDiff = (daysDiff - rem)/7;
            weekNum = weeksDiff + 1;
        }
        return weekNum;
    },

    /**
     * Get the first day of the week, for the give date. 
     * @param {Date} dt The date in the week for which the first day is required.
     * @param {Number} startOfWeek The index for the first day of the week, 0 = Sun, 1 = Mon ... 6 = Sat (defaults to 0)
     * @return {Date} The first day of the week
     */
    getFirstDayOfWeek : function (dt, startOfWeek) {
        startOfWeek = startOfWeek || 0;
        var dayOfWeekIndex = dt.getDay(),
            dayOfWeek = (dayOfWeekIndex - startOfWeek + 7) % 7;

        return this.subtract(dt, this.DAY, dayOfWeek);
    },

    /**
    * Determines if a given week overlaps two different years.
    * @method isYearOverlapWeek
    * @param {Date} weekBeginDate The JavaScript Date representing the first day of the week.
    * @return {Boolean} true if the date overlaps two different years.
    */
    isYearOverlapWeek : function(weekBeginDate) {
        var overlaps = false;
        var nextWeek = this.add(weekBeginDate, this.DAY, 6);
        if (nextWeek.getFullYear() != weekBeginDate.getFullYear()) {
            overlaps = true;
        }
        return overlaps;
    },

    /**
    * Determines if a given week overlaps two different months.
    * @method isMonthOverlapWeek
    * @param {Date} weekBeginDate The JavaScript Date representing the first day of the week.
    * @return {Boolean} true if the date overlaps two different months.
    */
    isMonthOverlapWeek : function(weekBeginDate) {
        var overlaps = false;
        var nextWeek = this.add(weekBeginDate, this.DAY, 6);
        if (nextWeek.getMonth() != weekBeginDate.getMonth()) {
            overlaps = true;
        }
        return overlaps;
    },

    /**
    * Gets the first day of a month containing a given date.
    * @method findMonthStart
    * @param {Date} date The JavaScript Date used to calculate the month start
    * @return {Date}  The JavaScript Date representing the first day of the month
    */
    findMonthStart : function(date) {
        var start = this.getDate(date.getFullYear(), date.getMonth(), 1);
        return start;
    },

    /**
    * Gets the last day of a month containing a given date.
    * @method findMonthEnd
    * @param {Date} date The JavaScript Date used to calculate the month end
    * @return {Date}  The JavaScript Date representing the last day of the month
    */
    findMonthEnd : function(date) {
        var start = this.findMonthStart(date);
        var nextMonth = this.add(start, this.MONTH, 1);
        var end = this.subtract(nextMonth, this.DAY, 1);
        return end;
    },

    /**
    * Clears the time fields from a given date, effectively setting the time to 12 noon.
    * @method clearTime
    * @param {Date} date The JavaScript Date for which the time fields will be cleared
    * @return {Date}  The JavaScript Date cleared of all time fields
    */
    clearTime : function(date) {
        date.setHours(12,0,0,0);
        return date;
    },

    /**
     * Returns a new JavaScript Date object, representing the given year, month and date. Time fields (hr, min, sec, ms) on the new Date object
     * are set to 0. The method allows Date instances to be created with the a year less than 100. "new Date(year, month, date)" implementations 
     * set the year to 19xx if a year (xx) which is less than 100 is provided.
     * <p>
     * <em>NOTE:</em>Validation on argument values is not performed. It is the caller's responsibility to ensure
     * arguments are valid as per the ECMAScript-262 Date object specification for the new Date(year, month[, date]) constructor.
     * </p>
     * @method getDate
     * @param {Number} y Year.
     * @param {Number} m Month index from 0 (Jan) to 11 (Dec).
     * @param {Number} d (optional) Date from 1 to 31. If not provided, defaults to 1.
     * @return {Date} The JavaScript date object with year, month, date set as provided.
     */
    getDate : function(y, m, d) {
        var dt = null;
        if (YAHOO.lang.isUndefined(d)) {
            d = 1;
        }
        if (y >= 100) {
            dt = new Date(y, m, d);
        } else {
            dt = new Date();
            dt.setFullYear(y);
            dt.setMonth(m);
            dt.setDate(d);
            dt.setHours(0,0,0,0);
        }
        return dt;
    }
};
/**
* The Calendar component is a UI control that enables users to choose one or more dates from a graphical calendar presented in a one-month or
* multi-month interface. Calendars are generated entirely via script and can be navigated without any page refreshes.
* @module    calendar
* @title    Calendar
* @namespace  YAHOO.widget
* @requires  yahoo,dom,event
*/
(function(){

    var Dom = YAHOO.util.Dom,
        Event = YAHOO.util.Event,
        Lang = YAHOO.lang,
        DateMath = YAHOO.widget.DateMath;

/**
* Calendar is the base class for the Calendar widget. In its most basic
* implementation, it has the ability to render a calendar widget on the page
* that can be manipulated to select a single date, move back and forth between
* months and years.
* <p>To construct the placeholder for the calendar widget, the code is as
* follows:
*   <xmp>
*       <div id="calContainer"></div>
*   </xmp>
* </p>
* <p>
* <strong>NOTE: As of 2.4.0, the constructor's ID argument is optional.</strong>
* The Calendar can be constructed by simply providing a container ID string, 
* or a reference to a container DIV HTMLElement (the element needs to exist 
* in the document).
* 
* E.g.:
*   <xmp>
*       var c = new YAHOO.widget.Calendar("calContainer", configOptions);
*   </xmp>
* or:
*   <xmp>
*       var containerDiv = YAHOO.util.Dom.get("calContainer");
*       var c = new YAHOO.widget.Calendar(containerDiv, configOptions);
*   </xmp>
* </p>
* <p>
* If not provided, the ID will be generated from the container DIV ID by adding an "_t" suffix.
* For example if an ID is not provided, and the container's ID is "calContainer", the Calendar's ID will be set to "calContainer_t".
* </p>
* 
* @namespace YAHOO.widget
* @class Calendar
* @constructor
* @param {String} id optional The id of the table element that will represent the Calendar widget. As of 2.4.0, this argument is optional.
* @param {String | HTMLElement} container The id of the container div element that will wrap the Calendar table, or a reference to a DIV element which exists in the document.
* @param {Object} config optional The configuration object containing the initial configuration values for the Calendar.
*/
function Calendar(id, containerId, config) {
    this.init.apply(this, arguments);
}

/**
* The path to be used for images loaded for the Calendar
* @property YAHOO.widget.Calendar.IMG_ROOT
* @static
* @deprecated   You can now customize images by overriding the calclose, calnavleft and calnavright default CSS classes for the close icon, left arrow and right arrow respectively
* @type String
*/
Calendar.IMG_ROOT = null;

/**
* Type constant used for renderers to represent an individual date (M/D/Y)
* @property YAHOO.widget.Calendar.DATE
* @static
* @final
* @type String
*/
Calendar.DATE = "D";

/**
* Type constant used for renderers to represent an individual date across any year (M/D)
* @property YAHOO.widget.Calendar.MONTH_DAY
* @static
* @final
* @type String
*/
Calendar.MONTH_DAY = "MD";

/**
* Type constant used for renderers to represent a weekday
* @property YAHOO.widget.Calendar.WEEKDAY
* @static
* @final
* @type String
*/
Calendar.WEEKDAY = "WD";

/**
* Type constant used for renderers to represent a range of individual dates (M/D/Y-M/D/Y)
* @property YAHOO.widget.Calendar.RANGE
* @static
* @final
* @type String
*/
Calendar.RANGE = "R";

/**
* Type constant used for renderers to represent a month across any year
* @property YAHOO.widget.Calendar.MONTH
* @static
* @final
* @type String
*/
Calendar.MONTH = "M";

/**
* Constant that represents the total number of date cells that are displayed in a given month
* @property YAHOO.widget.Calendar.DISPLAY_DAYS
* @static
* @final
* @type Number
*/
Calendar.DISPLAY_DAYS = 42;

/**
* Constant used for halting the execution of the remainder of the render stack
* @property YAHOO.widget.Calendar.STOP_RENDER
* @static
* @final
* @type String
*/
Calendar.STOP_RENDER = "S";

/**
* Constant used to represent short date field string formats (e.g. Tu or Feb)
* @property YAHOO.widget.Calendar.SHORT
* @static
* @final
* @type String
*/
Calendar.SHORT = "short";

/**
* Constant used to represent long date field string formats (e.g. Monday or February)
* @property YAHOO.widget.Calendar.LONG
* @static
* @final
* @type String
*/
Calendar.LONG = "long";

/**
* Constant used to represent medium date field string formats (e.g. Mon)
* @property YAHOO.widget.Calendar.MEDIUM
* @static
* @final
* @type String
*/
Calendar.MEDIUM = "medium";

/**
* Constant used to represent single character date field string formats (e.g. M, T, W)
* @property YAHOO.widget.Calendar.ONE_CHAR
* @static
* @final
* @type String
*/
Calendar.ONE_CHAR = "1char";

/**
* The set of default Config property keys and values for the Calendar.
*
* <p>
* NOTE: This property is made public in order to allow users to change 
* the default values of configuration properties. Users should not 
* modify the key string, unless they are overriding the Calendar implementation
* </p>
*
* <p>
* The property is an object with key/value pairs, the key being the 
* uppercase configuration property name and the value being an object 
* literal with a key string property, and a value property, specifying the 
* default value of the property. To override a default value, you can set
* the value property, for example, <code>YAHOO.widget.Calendar.DEFAULT_CONFIG.MULTI_SELECT.value = true;</code>
* 
* @property YAHOO.widget.Calendar.DEFAULT_CONFIG
* @static
* @type Object
*/

Calendar.DEFAULT_CONFIG = {
    YEAR_OFFSET : {key:"year_offset", value:0, supercedes:["pagedate", "selected", "mindate","maxdate"]},
    TODAY : {key:"today", value:new Date(), supercedes:["pagedate"]}, 
    PAGEDATE : {key:"pagedate", value:null},
    SELECTED : {key:"selected", value:[]},
    TITLE : {key:"title", value:""},
    CLOSE : {key:"close", value:false},
    IFRAME : {key:"iframe", value:(YAHOO.env.ua.ie && YAHOO.env.ua.ie <= 6) ? true : false},
    MINDATE : {key:"mindate", value:null},
    MAXDATE : {key:"maxdate", value:null},
    MULTI_SELECT : {key:"multi_select", value:false},
    START_WEEKDAY : {key:"start_weekday", value:0},
    SHOW_WEEKDAYS : {key:"show_weekdays", value:true},
    SHOW_WEEK_HEADER : {key:"show_week_header", value:false},
    SHOW_WEEK_FOOTER : {key:"show_week_footer", value:false},
    HIDE_BLANK_WEEKS : {key:"hide_blank_weeks", value:false},
    NAV_ARROW_LEFT: {key:"nav_arrow_left", value:null} ,
    NAV_ARROW_RIGHT : {key:"nav_arrow_right", value:null} ,
    MONTHS_SHORT : {key:"months_short", value:["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"]},
    MONTHS_LONG: {key:"months_long", value:["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"]},
    WEEKDAYS_1CHAR: {key:"weekdays_1char", value:["S", "M", "T", "W", "T", "F", "S"]},
    WEEKDAYS_SHORT: {key:"weekdays_short", value:["Su", "Mo", "Tu", "We", "Th", "Fr", "Sa"]},
    WEEKDAYS_MEDIUM: {key:"weekdays_medium", value:["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"]},
    WEEKDAYS_LONG: {key:"weekdays_long", value:["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"]},
    LOCALE_MONTHS:{key:"locale_months", value:"long"},
    LOCALE_WEEKDAYS:{key:"locale_weekdays", value:"short"},
    DATE_DELIMITER:{key:"date_delimiter", value:","},
    DATE_FIELD_DELIMITER:{key:"date_field_delimiter", value:"/"},
    DATE_RANGE_DELIMITER:{key:"date_range_delimiter", value:"-"},
    MY_MONTH_POSITION:{key:"my_month_position", value:1},
    MY_YEAR_POSITION:{key:"my_year_position", value:2},
    MD_MONTH_POSITION:{key:"md_month_position", value:1},
    MD_DAY_POSITION:{key:"md_day_position", value:2},
    MDY_MONTH_POSITION:{key:"mdy_month_position", value:1},
    MDY_DAY_POSITION:{key:"mdy_day_position", value:2},
    MDY_YEAR_POSITION:{key:"mdy_year_position", value:3},
    MY_LABEL_MONTH_POSITION:{key:"my_label_month_position", value:1},
    MY_LABEL_YEAR_POSITION:{key:"my_label_year_position", value:2},
    MY_LABEL_MONTH_SUFFIX:{key:"my_label_month_suffix", value:" "},
    MY_LABEL_YEAR_SUFFIX:{key:"my_label_year_suffix", value:""},
    NAV: {key:"navigator", value: null},
    STRINGS : { 
        key:"strings",
        value: {
            previousMonth : "Previous Month",
            nextMonth : "Next Month",
            close: "Close"
        },
        supercedes : ["close", "title"]
    }
};

/**
* The set of default Config property keys and values for the Calendar
* @property YAHOO.widget.Calendar._DEFAULT_CONFIG
* @deprecated Made public. See the public DEFAULT_CONFIG property for details
* @final
* @static
* @private
* @type Object
*/
Calendar._DEFAULT_CONFIG = Calendar.DEFAULT_CONFIG;

var DEF_CFG = Calendar.DEFAULT_CONFIG;

/**
* The set of Custom Event types supported by the Calendar
* @property YAHOO.widget.Calendar._EVENT_TYPES
* @final
* @static
* @private
* @type Object
*/
Calendar._EVENT_TYPES = {
    BEFORE_SELECT : "beforeSelect", 
    SELECT : "select",
    BEFORE_DESELECT : "beforeDeselect",
    DESELECT : "deselect",
    CHANGE_PAGE : "changePage",
    BEFORE_RENDER : "beforeRender",
    RENDER : "render",
    BEFORE_DESTROY : "beforeDestroy",
    DESTROY : "destroy",
    RESET : "reset",
    CLEAR : "clear",
    BEFORE_HIDE : "beforeHide",
    HIDE : "hide",
    BEFORE_SHOW : "beforeShow",
    SHOW : "show",
    BEFORE_HIDE_NAV : "beforeHideNav",
    HIDE_NAV : "hideNav",
    BEFORE_SHOW_NAV : "beforeShowNav",
    SHOW_NAV : "showNav",
    BEFORE_RENDER_NAV : "beforeRenderNav",
    RENDER_NAV : "renderNav"
};

/**
* The set of default style constants for the Calendar
* @property YAHOO.widget.Calendar.STYLES
* @static
* @type Object An object with name/value pairs for the class name identifier/value.
*/
Calendar.STYLES = {
    CSS_ROW_HEADER: "calrowhead",
    CSS_ROW_FOOTER: "calrowfoot",
    CSS_CELL : "calcell",
    CSS_CELL_SELECTOR : "selector",
    CSS_CELL_SELECTED : "selected",
    CSS_CELL_SELECTABLE : "selectable",
    CSS_CELL_RESTRICTED : "restricted",
    CSS_CELL_TODAY : "today",
    CSS_CELL_OOM : "oom",
    CSS_CELL_OOB : "previous",
    CSS_HEADER : "calheader",
    CSS_HEADER_TEXT : "calhead",
    CSS_BODY : "calbody",
    CSS_WEEKDAY_CELL : "calweekdaycell",
    CSS_WEEKDAY_ROW : "calweekdayrow",
    CSS_FOOTER : "calfoot",
    CSS_CALENDAR : "yui-calendar",
    CSS_SINGLE : "single",
    CSS_CONTAINER : "yui-calcontainer",
    CSS_NAV_LEFT : "calnavleft",
    CSS_NAV_RIGHT : "calnavright",
    CSS_NAV : "calnav",
    CSS_CLOSE : "calclose",
    CSS_CELL_TOP : "calcelltop",
    CSS_CELL_LEFT : "calcellleft",
    CSS_CELL_RIGHT : "calcellright",
    CSS_CELL_BOTTOM : "calcellbottom",
    CSS_CELL_HOVER : "calcellhover",
    CSS_CELL_HIGHLIGHT1 : "highlight1",
    CSS_CELL_HIGHLIGHT2 : "highlight2",
    CSS_CELL_HIGHLIGHT3 : "highlight3",
    CSS_CELL_HIGHLIGHT4 : "highlight4",
    CSS_WITH_TITLE: "withtitle",
    CSS_FIXED_SIZE: "fixedsize",
    CSS_LINK_CLOSE: "link-close"
};

/**
* The set of default style constants for the Calendar
* @property YAHOO.widget.Calendar._STYLES
* @deprecated Made public. See the public STYLES property for details
* @final
* @static
* @private
* @type Object
*/
Calendar._STYLES = Calendar.STYLES;

Calendar.prototype = {

    /**
    * The configuration object used to set up the calendars various locale and style options.
    * @property Config
    * @private
    * @deprecated Configuration properties should be set by calling Calendar.cfg.setProperty.
    * @type Object
    */
    Config : null,

    /**
    * The parent CalendarGroup, only to be set explicitly by the parent group
    * @property parent
    * @type CalendarGroup
    */ 
    parent : null,

    /**
    * The index of this item in the parent group
    * @property index
    * @type Number
    */
    index : -1,

    /**
    * The collection of calendar table cells
    * @property cells
    * @type HTMLTableCellElement[]
    */
    cells : null,

    /**
    * The collection of calendar cell dates that is parallel to the cells collection. The array contains dates field arrays in the format of [YYYY, M, D].
    * @property cellDates
    * @type Array[](Number[])
    */
    cellDates : null,

    /**
    * The id that uniquely identifies this Calendar.
    * @property id
    * @type String
    */
    id : null,

    /**
    * The unique id associated with the Calendar's container
    * @property containerId
    * @type String
    */
    containerId: null,

    /**
    * The DOM element reference that points to this calendar's container element. The calendar will be inserted into this element when the shell is rendered.
    * @property oDomContainer
    * @type HTMLElement
    */
    oDomContainer : null,

    /**
    * A Date object representing today's date.
    * @deprecated Use the "today" configuration property
    * @property today
    * @type Date
    */
    today : null,

    /**
    * The list of render functions, along with required parameters, used to render cells. 
    * @property renderStack
    * @type Array[]
    */
    renderStack : null,

    /**
    * A copy of the initial render functions created before rendering.
    * @property _renderStack
    * @private
    * @type Array
    */
    _renderStack : null,

    /**
    * A reference to the CalendarNavigator instance created for this Calendar.
    * Will be null if the "navigator" configuration property has not been set
    * @property oNavigator
    * @type CalendarNavigator
    */
    oNavigator : null,

    /**
    * The private list of initially selected dates.
    * @property _selectedDates
    * @private
    * @type Array
    */
    _selectedDates : null,

    /**
    * A map of DOM event handlers to attach to cells associated with specific CSS class names
    * @property domEventMap
    * @type Object
    */
    domEventMap : null,

    /**
     * Protected helper used to parse Calendar constructor/init arguments.
     *
     * As of 2.4.0, Calendar supports a simpler constructor 
     * signature. This method reconciles arguments
     * received in the pre 2.4.0 and 2.4.0 formats.
     * 
     * @protected
     * @method _parseArgs
     * @param {Array} Function "arguments" array
     * @return {Object} Object with id, container, config properties containing
     * the reconciled argument values.
     **/
    _parseArgs : function(args) {
        /*
           2.4.0 Constructors signatures

           new Calendar(String)
           new Calendar(HTMLElement)
           new Calendar(String, ConfigObject)
           new Calendar(HTMLElement, ConfigObject)

           Pre 2.4.0 Constructor signatures

           new Calendar(String, String)
           new Calendar(String, HTMLElement)
           new Calendar(String, String, ConfigObject)
           new Calendar(String, HTMLElement, ConfigObject)
         */
        var nArgs = {id:null, container:null, config:null};

        if (args && args.length && args.length > 0) {
            switch (args.length) {
                case 1:
                    nArgs.id = null;
                    nArgs.container = args[0];
                    nArgs.config = null;
                    break;
                case 2:
                    if (Lang.isObject(args[1]) && !args[1].tagName && !(args[1] instanceof String)) {
                        nArgs.id = null;
                        nArgs.container = args[0];
                        nArgs.config = args[1];
                    } else {
                        nArgs.id = args[0];
                        nArgs.container = args[1];
                        nArgs.config = null;
                    }
                    break;
                default: // 3+
                    nArgs.id = args[0];
                    nArgs.container = args[1];
                    nArgs.config = args[2];
                    break;
            }
        } else {
            this.logger.log("Invalid constructor/init arguments", "error");
        }
        return nArgs;
    },

    /**
    * Initializes the Calendar widget.
    * @method init
    *
    * @param {String} id optional The id of the table element that will represent the Calendar widget. As of 2.4.0, this argument is optional.
    * @param {String | HTMLElement} container The id of the container div element that will wrap the Calendar table, or a reference to a DIV element which exists in the document.
    * @param {Object} config optional The configuration object containing the initial configuration values for the Calendar.
    */
    init : function(id, container, config) {
        // Normalize 2.4.0, pre 2.4.0 args
        var nArgs = this._parseArgs(arguments);

        id = nArgs.id;
        container = nArgs.container;
        config = nArgs.config;

        this.oDomContainer = Dom.get(container);
        if (!this.oDomContainer) { this.logger.log("Container not found in document.", "error"); }

        if (!this.oDomContainer.id) {
            this.oDomContainer.id = Dom.generateId();
        }
        if (!id) {
            id = this.oDomContainer.id + "_t";
        }

        this.id = id;
        this.containerId = this.oDomContainer.id;

        this.logger = new YAHOO.widget.LogWriter("Calendar " + this.id);
        this.initEvents();

        /**
        * The Config object used to hold the configuration variables for the Calendar
        * @property cfg
        * @type YAHOO.util.Config
        */
        this.cfg = new YAHOO.util.Config(this);

        /**
        * The local object which contains the Calendar's options
        * @property Options
        * @type Object
        */
        this.Options = {};

        /**
        * The local object which contains the Calendar's locale settings
        * @property Locale
        * @type Object
        */
        this.Locale = {};

        this.initStyles();

        Dom.addClass(this.oDomContainer, this.Style.CSS_CONTAINER);
        Dom.addClass(this.oDomContainer, this.Style.CSS_SINGLE);

        this.cellDates = [];
        this.cells = [];
        this.renderStack = [];
        this._renderStack = [];

        this.setupConfig();

        if (config) {
            this.cfg.applyConfig(config, true);
        }

        this.cfg.fireQueue();

        this.today = this.cfg.getProperty("today");
    },

    /**
    * Default Config listener for the iframe property. If the iframe config property is set to true, 
    * renders the built-in IFRAME shim if the container is relatively or absolutely positioned.
    * 
    * @method configIframe
    */
    configIframe : function(type, args, obj) {
        var useIframe = args[0];
    
        if (!this.parent) {
            if (Dom.inDocument(this.oDomContainer)) {
                if (useIframe) {
                    var pos = Dom.getStyle(this.oDomContainer, "position");
                    
                    if (pos == "absolute" || pos == "relative") {
                        
                        if (!Dom.inDocument(this.iframe)) {
                            this.iframe = document.createElement("iframe");
                            this.iframe.src = "javascript:false;";
    
                            Dom.setStyle(this.iframe, "opacity", "0");
    
                            if (YAHOO.env.ua.ie && YAHOO.env.ua.ie <= 6) {
                                Dom.addClass(this.iframe, this.Style.CSS_FIXED_SIZE);
                            }
    
                            this.oDomContainer.insertBefore(this.iframe, this.oDomContainer.firstChild);
                        }
                    }
                } else {
                    if (this.iframe) {
                        if (this.iframe.parentNode) {
                            this.iframe.parentNode.removeChild(this.iframe);
                        }
                        this.iframe = null;
                    }
                }
            }
        }
    },

    /**
    * Default handler for the "title" property
    * @method configTitle
    */
    configTitle : function(type, args, obj) {
        var title = args[0];

        // "" disables title bar
        if (title) {
            this.createTitleBar(title);
        } else {
            var close = this.cfg.getProperty(DEF_CFG.CLOSE.key);
            if (!close) {
                this.removeTitleBar();
            } else {
                this.createTitleBar("&#160;");
            }
        }
    },
    
    /**
    * Default handler for the "close" property
    * @method configClose
    */
    configClose : function(type, args, obj) {
        var close = args[0],
            title = this.cfg.getProperty(DEF_CFG.TITLE.key);
    
        if (close) {
            if (!title) {
                this.createTitleBar("&#160;");
            }
            this.createCloseButton();
        } else {
            this.removeCloseButton();
            if (!title) {
                this.removeTitleBar();
            }
        }
    },

    /**
    * Initializes Calendar's built-in CustomEvents
    * @method initEvents
    */
    initEvents : function() {

        var defEvents = Calendar._EVENT_TYPES,
            CE = YAHOO.util.CustomEvent,
            cal = this; // To help with minification

        /**
        * Fired before a date selection is made
        * @event beforeSelectEvent
        */
        cal.beforeSelectEvent = new CE(defEvents.BEFORE_SELECT); 

        /**
        * Fired when a date selection is made
        * @event selectEvent
        * @param {Array} Array of Date field arrays in the format [YYYY, MM, DD].
        */
        cal.selectEvent = new CE(defEvents.SELECT);

        /**
        * Fired before a date or set of dates is deselected
        * @event beforeDeselectEvent
        */
        cal.beforeDeselectEvent = new CE(defEvents.BEFORE_DESELECT);

        /**
        * Fired when a date or set of dates is deselected
        * @event deselectEvent
        * @param {Array} Array of Date field arrays in the format [YYYY, MM, DD].
        */
        cal.deselectEvent = new CE(defEvents.DESELECT);
    
        /**
        * Fired when the Calendar page is changed
        * @event changePageEvent
        * @param {Date} prevDate The date before the page was changed
        * @param {Date} newDate The date after the page was changed
        */
        cal.changePageEvent = new CE(defEvents.CHANGE_PAGE);
    
        /**
        * Fired before the Calendar is rendered
        * @event beforeRenderEvent
        */
        cal.beforeRenderEvent = new CE(defEvents.BEFORE_RENDER);
    
        /**
        * Fired when the Calendar is rendered
        * @event renderEvent
        */
        cal.renderEvent = new CE(defEvents.RENDER);

        /**
        * Fired just before the Calendar is to be destroyed
        * @event beforeDestroyEvent
        */
        cal.beforeDestroyEvent = new CE(defEvents.BEFORE_DESTROY);

        /**
        * Fired after the Calendar is destroyed. This event should be used
        * for notification only. When this event is fired, important Calendar instance
        * properties, dom references and event listeners have already been 
        * removed/dereferenced, and hence the Calendar instance is not in a usable 
        * state.
        *
        * @event destroyEvent
        */
        cal.destroyEvent = new CE(defEvents.DESTROY);

        /**
        * Fired when the Calendar is reset
        * @event resetEvent
        */
        cal.resetEvent = new CE(defEvents.RESET);

        /**
        * Fired when the Calendar is cleared
        * @event clearEvent
        */
        cal.clearEvent = new CE(defEvents.CLEAR);

        /**
        * Fired just before the Calendar is to be shown
        * @event beforeShowEvent
        */
        cal.beforeShowEvent = new CE(defEvents.BEFORE_SHOW);

        /**
        * Fired after the Calendar is shown
        * @event showEvent
        */
        cal.showEvent = new CE(defEvents.SHOW);

        /**
        * Fired just before the Calendar is to be hidden
        * @event beforeHideEvent
        */
        cal.beforeHideEvent = new CE(defEvents.BEFORE_HIDE);

        /**
        * Fired after the Calendar is hidden
        * @event hideEvent
        */
        cal.hideEvent = new CE(defEvents.HIDE);

        /**
        * Fired just before the CalendarNavigator is to be shown
        * @event beforeShowNavEvent
        */
        cal.beforeShowNavEvent = new CE(defEvents.BEFORE_SHOW_NAV);
    
        /**
        * Fired after the CalendarNavigator is shown
        * @event showNavEvent
        */
        cal.showNavEvent = new CE(defEvents.SHOW_NAV);
    
        /**
        * Fired just before the CalendarNavigator is to be hidden
        * @event beforeHideNavEvent
        */
        cal.beforeHideNavEvent = new CE(defEvents.BEFORE_HIDE_NAV);
    
        /**
        * Fired after the CalendarNavigator is hidden
        * @event hideNavEvent
        */
        cal.hideNavEvent = new CE(defEvents.HIDE_NAV);

        /**
        * Fired just before the CalendarNavigator is to be rendered
        * @event beforeRenderNavEvent
        */
        cal.beforeRenderNavEvent = new CE(defEvents.BEFORE_RENDER_NAV);

        /**
        * Fired after the CalendarNavigator is rendered
        * @event renderNavEvent
        */
        cal.renderNavEvent = new CE(defEvents.RENDER_NAV);

        cal.beforeSelectEvent.subscribe(cal.onBeforeSelect, this, true);
        cal.selectEvent.subscribe(cal.onSelect, this, true);
        cal.beforeDeselectEvent.subscribe(cal.onBeforeDeselect, this, true);
        cal.deselectEvent.subscribe(cal.onDeselect, this, true);
        cal.changePageEvent.subscribe(cal.onChangePage, this, true);
        cal.renderEvent.subscribe(cal.onRender, this, true);
        cal.resetEvent.subscribe(cal.onReset, this, true);
        cal.clearEvent.subscribe(cal.onClear, this, true);
    },

    /**
    * The default event handler for clicks on the "Previous Month" navigation UI
    *
    * @method doPreviousMonthNav
    * @param {DOMEvent} e The DOM event
    * @param {Calendar} cal A reference to the calendar
    */
    doPreviousMonthNav : function(e, cal) {
        Event.preventDefault(e);
        // previousMonth invoked in a timeout, to allow
        // event to bubble up, with correct target. Calling
        // previousMonth, will call render which will remove 
        // HTML which generated the event, resulting in an 
        // invalid event target in certain browsers.
        setTimeout(function() {
            cal.previousMonth();
            var navs = Dom.getElementsByClassName(cal.Style.CSS_NAV_LEFT, "a", cal.oDomContainer);
            if (navs && navs[0]) {
                try {
                    navs[0].focus();
                } catch (ex) {
                    // ignore
                }
            }
        }, 0);
    },

    /**
     * The default event handler for clicks on the "Next Month" navigation UI
     *
     * @method doNextMonthNav
     * @param {DOMEvent} e The DOM event
     * @param {Calendar} cal A reference to the calendar
     */
    doNextMonthNav : function(e, cal) {
        Event.preventDefault(e);
        setTimeout(function() {
            cal.nextMonth();
            var navs = Dom.getElementsByClassName(cal.Style.CSS_NAV_RIGHT, "a", cal.oDomContainer);
            if (navs && navs[0]) {
                try {
                    navs[0].focus();
                } catch (ex) {
                    // ignore
                }
            }
        }, 0);
    },

    /**
    * The default event handler for date cell selection. Currently attached to 
    * the Calendar's bounding box, referenced by it's <a href="#property_oDomContainer">oDomContainer</a> property.
    *
    * @method doSelectCell
    * @param {DOMEvent} e The DOM event
    * @param {Calendar} cal A reference to the calendar
    */
    doSelectCell : function(e, cal) {
        var cell, d, date, index;

        var target = Event.getTarget(e),
            tagName = target.tagName.toLowerCase(),
            defSelector = false;

        while (tagName != "td" && !Dom.hasClass(target, cal.Style.CSS_CELL_SELECTABLE)) {

            if (!defSelector && tagName == "a" && Dom.hasClass(target, cal.Style.CSS_CELL_SELECTOR)) {
                defSelector = true;
            }

            target = target.parentNode;
            tagName = target.tagName.toLowerCase();

            if (target == this.oDomContainer || tagName == "html") {
                return;
            }
        }

        if (defSelector) {
            // Stop link href navigation for default renderer
            Event.preventDefault(e);
        }
    
        cell = target;

        if (Dom.hasClass(cell, cal.Style.CSS_CELL_SELECTABLE)) {
            index = cal.getIndexFromId(cell.id);
            if (index > -1) {
                d = cal.cellDates[index];
                if (d) {
                    date = DateMath.getDate(d[0],d[1]-1,d[2]);
                
                    var link;

                    cal.logger.log("Selecting cell " + index + " via click", "info");
                    if (cal.Options.MULTI_SELECT) {
                        link = cell.getElementsByTagName("a")[0];
                        if (link) {
                            link.blur();
                        }

                        var cellDate = cal.cellDates[index];
                        var cellDateIndex = cal._indexOfSelectedFieldArray(cellDate);

                        if (cellDateIndex > -1) { 
                            cal.deselectCell(index);
                        } else {
                            cal.selectCell(index);
                        } 

                    } else {
                        link = cell.getElementsByTagName("a")[0];
                        if (link) {
                            link.blur();
                        }
                        cal.selectCell(index);
                    }
                }
            }
        }
    },

    /**
    * The event that is executed when the user hovers over a cell
    * @method doCellMouseOver
    * @param {DOMEvent} e The event
    * @param {Calendar} cal A reference to the calendar passed by the Event utility
    */
    doCellMouseOver : function(e, cal) {
        var target;
        if (e) {
            target = Event.getTarget(e);
        } else {
            target = this;
        }

        while (target.tagName && target.tagName.toLowerCase() != "td") {
            target = target.parentNode;
            if (!target.tagName || target.tagName.toLowerCase() == "html") {
                return;
            }
        }

        if (Dom.hasClass(target, cal.Style.CSS_CELL_SELECTABLE)) {
            Dom.addClass(target, cal.Style.CSS_CELL_HOVER);
        }
    },

    /**
    * The event that is executed when the user moves the mouse out of a cell
    * @method doCellMouseOut
    * @param {DOMEvent} e The event
    * @param {Calendar} cal A reference to the calendar passed by the Event utility
    */
    doCellMouseOut : function(e, cal) {
        var target;
        if (e) {
            target = Event.getTarget(e);
        } else {
            target = this;
        }

        while (target.tagName && target.tagName.toLowerCase() != "td") {
            target = target.parentNode;
            if (!target.tagName || target.tagName.toLowerCase() == "html") {
                return;
            }
        }

        if (Dom.hasClass(target, cal.Style.CSS_CELL_SELECTABLE)) {
            Dom.removeClass(target, cal.Style.CSS_CELL_HOVER);
        }
    },

    setupConfig : function() {

        var cfg = this.cfg;

        /**
        * The date to use to represent "Today".
        *
        * @config today
        * @type Date
        * @default The client side date (new Date()) when the Calendar is instantiated.
        */
        cfg.addProperty(DEF_CFG.TODAY.key, { value: new Date(DEF_CFG.TODAY.value.getTime()), supercedes:DEF_CFG.TODAY.supercedes, handler:this.configToday, suppressEvent:true } );

        /**
        * The month/year representing the current visible Calendar date (mm/yyyy)
        * @config pagedate
        * @type String | Date
        * @default Today's date
        */
        cfg.addProperty(DEF_CFG.PAGEDATE.key, { value: DEF_CFG.PAGEDATE.value || new Date(DEF_CFG.TODAY.value.getTime()), handler:this.configPageDate } );

        /**
        * The date or range of dates representing the current Calendar selection
        * @config selected
        * @type String
        * @default []
        */
        cfg.addProperty(DEF_CFG.SELECTED.key, { value:DEF_CFG.SELECTED.value.concat(), handler:this.configSelected } );

        /**
        * The title to display above the Calendar's month header
        * @config title
        * @type String
        * @default ""
        */
        cfg.addProperty(DEF_CFG.TITLE.key, { value:DEF_CFG.TITLE.value, handler:this.configTitle } );

        /**
        * Whether or not a close button should be displayed for this Calendar
        * @config close
        * @type Boolean
        * @default false
        */
        cfg.addProperty(DEF_CFG.CLOSE.key, { value:DEF_CFG.CLOSE.value, handler:this.configClose } );

        /**
        * Whether or not an iframe shim should be placed under the Calendar to prevent select boxes from bleeding through in Internet Explorer 6 and below.
        * This property is enabled by default for IE6 and below. It is disabled by default for other browsers for performance reasons, but can be 
        * enabled if required.
        * 
        * @config iframe
        * @type Boolean
        * @default true for IE6 and below, false for all other browsers
        */
        cfg.addProperty(DEF_CFG.IFRAME.key, { value:DEF_CFG.IFRAME.value, handler:this.configIframe, validator:cfg.checkBoolean } );

        /**
        * The minimum selectable date in the current Calendar (mm/dd/yyyy)
        * @config mindate
        * @type String | Date
        * @default null
        */
        cfg.addProperty(DEF_CFG.MINDATE.key, { value:DEF_CFG.MINDATE.value, handler:this.configMinDate } );

        /**
        * The maximum selectable date in the current Calendar (mm/dd/yyyy)
        * @config maxdate
        * @type String | Date
        * @default null
        */
        cfg.addProperty(DEF_CFG.MAXDATE.key, { value:DEF_CFG.MAXDATE.value, handler:this.configMaxDate } );

        // Options properties
    
        /**
        * True if the Calendar should allow multiple selections. False by default.
        * @config MULTI_SELECT
        * @type Boolean
        * @default false
        */
        cfg.addProperty(DEF_CFG.MULTI_SELECT.key, { value:DEF_CFG.MULTI_SELECT.value, handler:this.configOptions, validator:cfg.checkBoolean } );

        /**
        * The weekday the week begins on. Default is 0 (Sunday = 0, Monday = 1 ... Saturday = 6).
        * @config START_WEEKDAY
        * @type number
        * @default 0
        */
        cfg.addProperty(DEF_CFG.START_WEEKDAY.key, { value:DEF_CFG.START_WEEKDAY.value, handler:this.configOptions, validator:cfg.checkNumber  } );
    
        /**
        * True if the Calendar should show weekday labels. True by default.
        * @config SHOW_WEEKDAYS
        * @type Boolean
        * @default true
        */
        cfg.addProperty(DEF_CFG.SHOW_WEEKDAYS.key, { value:DEF_CFG.SHOW_WEEKDAYS.value, handler:this.configOptions, validator:cfg.checkBoolean  } );
    
        /**
        * True if the Calendar should show week row headers. False by default.
        * @config SHOW_WEEK_HEADER
        * @type Boolean
        * @default false
        */
        cfg.addProperty(DEF_CFG.SHOW_WEEK_HEADER.key, { value:DEF_CFG.SHOW_WEEK_HEADER.value, handler:this.configOptions, validator:cfg.checkBoolean } );
    
        /**
        * True if the Calendar should show week row footers. False by default.
        * @config SHOW_WEEK_FOOTER
        * @type Boolean
        * @default false
        */ 
        cfg.addProperty(DEF_CFG.SHOW_WEEK_FOOTER.key,{ value:DEF_CFG.SHOW_WEEK_FOOTER.value, handler:this.configOptions, validator:cfg.checkBoolean } );
    
        /**
        * True if the Calendar should suppress weeks that are not a part of the current month. False by default.
        * @config HIDE_BLANK_WEEKS
        * @type Boolean
        * @default false
        */ 
        cfg.addProperty(DEF_CFG.HIDE_BLANK_WEEKS.key, { value:DEF_CFG.HIDE_BLANK_WEEKS.value, handler:this.configOptions, validator:cfg.checkBoolean } );
        
        /**
        * The image that should be used for the left navigation arrow.
        * @config NAV_ARROW_LEFT
        * @type String
        * @deprecated You can customize the image by overriding the default CSS class for the left arrow - "calnavleft"  
        * @default null
        */ 
        cfg.addProperty(DEF_CFG.NAV_ARROW_LEFT.key, { value:DEF_CFG.NAV_ARROW_LEFT.value, handler:this.configOptions } );
    
        /**
        * The image that should be used for the right navigation arrow.
        * @config NAV_ARROW_RIGHT
        * @type String
        * @deprecated You can customize the image by overriding the default CSS class for the right arrow - "calnavright"
        * @default null
        */ 
        cfg.addProperty(DEF_CFG.NAV_ARROW_RIGHT.key, { value:DEF_CFG.NAV_ARROW_RIGHT.value, handler:this.configOptions } );
    
        // Locale properties
    
        /**
        * The short month labels for the current locale.
        * @config MONTHS_SHORT
        * @type String[]
        * @default ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"]
        */
        cfg.addProperty(DEF_CFG.MONTHS_SHORT.key, { value:DEF_CFG.MONTHS_SHORT.value, handler:this.configLocale } );
        
        /**
        * The long month labels for the current locale.
        * @config MONTHS_LONG
        * @type String[]
        * @default ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"
        */ 
        cfg.addProperty(DEF_CFG.MONTHS_LONG.key,  { value:DEF_CFG.MONTHS_LONG.value, handler:this.configLocale } );

        /**
        * The 1-character weekday labels for the current locale.
        * @config WEEKDAYS_1CHAR
        * @type String[]
        * @default ["S", "M", "T", "W", "T", "F", "S"]
        */ 
        cfg.addProperty(DEF_CFG.WEEKDAYS_1CHAR.key, { value:DEF_CFG.WEEKDAYS_1CHAR.value, handler:this.configLocale } );
        
        /**
        * The short weekday labels for the current locale.
        * @config WEEKDAYS_SHORT
        * @type String[]
        * @default ["Su", "Mo", "Tu", "We", "Th", "Fr", "Sa"]
        */ 
        cfg.addProperty(DEF_CFG.WEEKDAYS_SHORT.key, { value:DEF_CFG.WEEKDAYS_SHORT.value, handler:this.configLocale } );
        
        /**
        * The medium weekday labels for the current locale.
        * @config WEEKDAYS_MEDIUM
        * @type String[]
        * @default ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"]
        */ 
        cfg.addProperty(DEF_CFG.WEEKDAYS_MEDIUM.key, { value:DEF_CFG.WEEKDAYS_MEDIUM.value, handler:this.configLocale } );
        
        /**
        * The long weekday labels for the current locale.
        * @config WEEKDAYS_LONG
        * @type String[]
        * @default ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"]
        */ 
        cfg.addProperty(DEF_CFG.WEEKDAYS_LONG.key, { value:DEF_CFG.WEEKDAYS_LONG.value, handler:this.configLocale } );

        /**
        * Refreshes the locale values used to build the Calendar.
        * @method refreshLocale
        * @private
        */
        var refreshLocale = function() {
            cfg.refireEvent(DEF_CFG.LOCALE_MONTHS.key);
            cfg.refireEvent(DEF_CFG.LOCALE_WEEKDAYS.key);
        };
    
        cfg.subscribeToConfigEvent(DEF_CFG.START_WEEKDAY.key, refreshLocale, this, true);
        cfg.subscribeToConfigEvent(DEF_CFG.MONTHS_SHORT.key, refreshLocale, this, true);
        cfg.subscribeToConfigEvent(DEF_CFG.MONTHS_LONG.key, refreshLocale, this, true);
        cfg.subscribeToConfigEvent(DEF_CFG.WEEKDAYS_1CHAR.key, refreshLocale, this, true);
        cfg.subscribeToConfigEvent(DEF_CFG.WEEKDAYS_SHORT.key, refreshLocale, this, true);
        cfg.subscribeToConfigEvent(DEF_CFG.WEEKDAYS_MEDIUM.key, refreshLocale, this, true);
        cfg.subscribeToConfigEvent(DEF_CFG.WEEKDAYS_LONG.key, refreshLocale, this, true);
       
        /**
        * The setting that determines which length of month labels should be used. Possible values are "short" and "long".
        * @config LOCALE_MONTHS
        * @type String
        * @default "long"
        */ 
        cfg.addProperty(DEF_CFG.LOCALE_MONTHS.key, { value:DEF_CFG.LOCALE_MONTHS.value, handler:this.configLocaleValues } );
        
        /**
        * The setting that determines which length of weekday labels should be used. Possible values are "1char", "short", "medium", and "long".
        * @config LOCALE_WEEKDAYS
        * @type String
        * @default "short"
        */ 
        cfg.addProperty(DEF_CFG.LOCALE_WEEKDAYS.key, { value:DEF_CFG.LOCALE_WEEKDAYS.value, handler:this.configLocaleValues } );

        /**
        * The positive or negative year offset from the Gregorian calendar year (assuming a January 1st rollover) to 
        * be used when displaying and parsing dates. NOTE: All JS Date objects returned by methods, or expected as input by
        * methods will always represent the Gregorian year, in order to maintain date/month/week values. 
        *
        * @config YEAR_OFFSET
        * @type Number
        * @default 0
        */
        cfg.addProperty(DEF_CFG.YEAR_OFFSET.key, { value:DEF_CFG.YEAR_OFFSET.value, supercedes:DEF_CFG.YEAR_OFFSET.supercedes, handler:this.configLocale  } );
    
        /**
        * The value used to delimit individual dates in a date string passed to various Calendar functions.
        * @config DATE_DELIMITER
        * @type String
        * @default ","
        */ 
        cfg.addProperty(DEF_CFG.DATE_DELIMITER.key,  { value:DEF_CFG.DATE_DELIMITER.value, handler:this.configLocale } );
    
        /**
        * The value used to delimit date fields in a date string passed to various Calendar functions.
        * @config DATE_FIELD_DELIMITER
        * @type String
        * @default "/"
        */ 
        cfg.addProperty(DEF_CFG.DATE_FIELD_DELIMITER.key, { value:DEF_CFG.DATE_FIELD_DELIMITER.value, handler:this.configLocale } );
    
        /**
        * The value used to delimit date ranges in a date string passed to various Calendar functions.
        * @config DATE_RANGE_DELIMITER
        * @type String
        * @default "-"
        */
        cfg.addProperty(DEF_CFG.DATE_RANGE_DELIMITER.key, { value:DEF_CFG.DATE_RANGE_DELIMITER.value, handler:this.configLocale } );
    
        /**
        * The position of the month in a month/year date string
        * @config MY_MONTH_POSITION
        * @type Number
        * @default 1
        */
        cfg.addProperty(DEF_CFG.MY_MONTH_POSITION.key, { value:DEF_CFG.MY_MONTH_POSITION.value, handler:this.configLocale, validator:cfg.checkNumber } );
    
        /**
        * The position of the year in a month/year date string
        * @config MY_YEAR_POSITION
        * @type Number
        * @default 2
        */
        cfg.addProperty(DEF_CFG.MY_YEAR_POSITION.key, { value:DEF_CFG.MY_YEAR_POSITION.value, handler:this.configLocale, validator:cfg.checkNumber } );
    
        /**
        * The position of the month in a month/day date string
        * @config MD_MONTH_POSITION
        * @type Number
        * @default 1
        */
        cfg.addProperty(DEF_CFG.MD_MONTH_POSITION.key, { value:DEF_CFG.MD_MONTH_POSITION.value, handler:this.configLocale, validator:cfg.checkNumber } );
    
        /**
        * The position of the day in a month/year date string
        * @config MD_DAY_POSITION
        * @type Number
        * @default 2
        */
        cfg.addProperty(DEF_CFG.MD_DAY_POSITION.key,  { value:DEF_CFG.MD_DAY_POSITION.value, handler:this.configLocale, validator:cfg.checkNumber } );
    
        /**
        * The position of the month in a month/day/year date string
        * @config MDY_MONTH_POSITION
        * @type Number
        * @default 1
        */
        cfg.addProperty(DEF_CFG.MDY_MONTH_POSITION.key, { value:DEF_CFG.MDY_MONTH_POSITION.value, handler:this.configLocale, validator:cfg.checkNumber } );
    
        /**
        * The position of the day in a month/day/year date string
        * @config MDY_DAY_POSITION
        * @type Number
        * @default 2
        */
        cfg.addProperty(DEF_CFG.MDY_DAY_POSITION.key, { value:DEF_CFG.MDY_DAY_POSITION.value, handler:this.configLocale, validator:cfg.checkNumber } );
    
        /**
        * The position of the year in a month/day/year date string
        * @config MDY_YEAR_POSITION
        * @type Number
        * @default 3
        */
        cfg.addProperty(DEF_CFG.MDY_YEAR_POSITION.key, { value:DEF_CFG.MDY_YEAR_POSITION.value, handler:this.configLocale, validator:cfg.checkNumber } );
        
        /**
        * The position of the month in the month year label string used as the Calendar header
        * @config MY_LABEL_MONTH_POSITION
        * @type Number
        * @default 1
        */
        cfg.addProperty(DEF_CFG.MY_LABEL_MONTH_POSITION.key, { value:DEF_CFG.MY_LABEL_MONTH_POSITION.value, handler:this.configLocale, validator:cfg.checkNumber } );
    
        /**
        * The position of the year in the month year label string used as the Calendar header
        * @config MY_LABEL_YEAR_POSITION
        * @type Number
        * @default 2
        */
        cfg.addProperty(DEF_CFG.MY_LABEL_YEAR_POSITION.key, { value:DEF_CFG.MY_LABEL_YEAR_POSITION.value, handler:this.configLocale, validator:cfg.checkNumber } );
        
        /**
        * The suffix used after the month when rendering the Calendar header
        * @config MY_LABEL_MONTH_SUFFIX
        * @type String
        * @default " "
        */
        cfg.addProperty(DEF_CFG.MY_LABEL_MONTH_SUFFIX.key, { value:DEF_CFG.MY_LABEL_MONTH_SUFFIX.value, handler:this.configLocale } );
        
        /**
        * The suffix used after the year when rendering the Calendar header
        * @config MY_LABEL_YEAR_SUFFIX
        * @type String
        * @default ""
        */
        cfg.addProperty(DEF_CFG.MY_LABEL_YEAR_SUFFIX.key, { value:DEF_CFG.MY_LABEL_YEAR_SUFFIX.value, handler:this.configLocale } );

        /**
        * Configuration for the Month/Year CalendarNavigator UI which allows the user to jump directly to a 
        * specific Month/Year without having to scroll sequentially through months.
        * <p>
        * Setting this property to null (default value) or false, will disable the CalendarNavigator UI.
        * </p>
        * <p>
        * Setting this property to true will enable the CalendarNavigatior UI with the default CalendarNavigator configuration values.
        * </p>
        * <p>
        * This property can also be set to an object literal containing configuration properties for the CalendarNavigator UI.
        * The configuration object expects the the following case-sensitive properties, with the "strings" property being a nested object.
        * Any properties which are not provided will use the default values (defined in the CalendarNavigator class).
        * </p>
        * <dl>
        * <dt>strings</dt>
        * <dd><em>Object</em> :  An object with the properties shown below, defining the string labels to use in the Navigator's UI
        *     <dl>
        *         <dt>month</dt><dd><em>String</em> : The string to use for the month label. Defaults to "Month".</dd>
        *         <dt>year</dt><dd><em>String</em> : The string to use for the year label. Defaults to "Year".</dd>
        *         <dt>submit</dt><dd><em>String</em> : The string to use for the submit button label. Defaults to "Okay".</dd>
        *         <dt>cancel</dt><dd><em>String</em> : The string to use for the cancel button label. Defaults to "Cancel".</dd>
        *         <dt>invalidYear</dt><dd><em>String</em> : The string to use for invalid year values. Defaults to "Year needs to be a number".</dd>
        *     </dl>
        * </dd>
        * <dt>monthFormat</dt><dd><em>String</em> : The month format to use. Either YAHOO.widget.Calendar.LONG, or YAHOO.widget.Calendar.SHORT. Defaults to YAHOO.widget.Calendar.LONG</dd>
        * <dt>initialFocus</dt><dd><em>String</em> : Either "year" or "month" specifying which input control should get initial focus. Defaults to "year"</dd>
        * </dl>
        * <p>E.g.</p>
        * <pre>
        * var navConfig = {
        *   strings: {
        *    month:"Calendar Month",
        *    year:"Calendar Year",
        *    submit: "Submit",
        *    cancel: "Cancel",
        *    invalidYear: "Please enter a valid year"
        *   },
        *   monthFormat: YAHOO.widget.Calendar.SHORT,
        *   initialFocus: "month"
        * }
        * </pre>
        * @config navigator
        * @type {Object|Boolean}
        * @default null
        */
        cfg.addProperty(DEF_CFG.NAV.key, { value:DEF_CFG.NAV.value, handler:this.configNavigator } );

        /**
         * The map of UI strings which the Calendar UI uses.
         *
         * @config strings
         * @type {Object}
         * @default An object with the properties shown below:
         *     <dl>
         *         <dt>previousMonth</dt><dd><em>String</em> : The string to use for the "Previous Month" navigation UI. Defaults to "Previous Month".</dd>
         *         <dt>nextMonth</dt><dd><em>String</em> : The string to use for the "Next Month" navigation UI. Defaults to "Next Month".</dd>
         *         <dt>close</dt><dd><em>String</em> : The string to use for the close button label. Defaults to "Close".</dd>
         *     </dl>
         */
        cfg.addProperty(DEF_CFG.STRINGS.key, { 
            value:DEF_CFG.STRINGS.value,
            handler:this.configStrings,
            validator: function(val) {
                return Lang.isObject(val);
            },
            supercedes:DEF_CFG.STRINGS.supercedes
        });
    },

    /**
    * The default handler for the "strings" property
    * @method configStrings
    */
    configStrings : function(type, args, obj) {
        var val = Lang.merge(DEF_CFG.STRINGS.value, args[0]);
        this.cfg.setProperty(DEF_CFG.STRINGS.key, val, true);
    },

    /**
    * The default handler for the "pagedate" property
    * @method configPageDate
    */
    configPageDate : function(type, args, obj) {
        this.cfg.setProperty(DEF_CFG.PAGEDATE.key, this._parsePageDate(args[0]), true);
    },

    /**
    * The default handler for the "mindate" property
    * @method configMinDate
    */
    configMinDate : function(type, args, obj) {
        var val = args[0];
        if (Lang.isString(val)) {
            val = this._parseDate(val);
            this.cfg.setProperty(DEF_CFG.MINDATE.key, DateMath.getDate(val[0],(val[1]-1),val[2]));
        }
    },

    /**
    * The default handler for the "maxdate" property
    * @method configMaxDate
    */
    configMaxDate : function(type, args, obj) {
        var val = args[0];
        if (Lang.isString(val)) {
            val = this._parseDate(val);
            this.cfg.setProperty(DEF_CFG.MAXDATE.key, DateMath.getDate(val[0],(val[1]-1),val[2]));
        }
    },

    /**
    * The default handler for the "today" property
    * @method configToday
    */
    configToday : function(type, args, obj) {
        // Only do this for initial set. Changing the today property after the initial
        // set, doesn't affect pagedate
        var val = args[0];
        if (Lang.isString(val)) {
            val = this._parseDate(val);
        }
        var today = DateMath.clearTime(val);
        if (!this.cfg.initialConfig[DEF_CFG.PAGEDATE.key]) {
            this.cfg.setProperty(DEF_CFG.PAGEDATE.key, today);
        }
        this.today = today;
        this.cfg.setProperty(DEF_CFG.TODAY.key, today, true);
    },

    /**
    * The default handler for the "selected" property
    * @method configSelected
    */
    configSelected : function(type, args, obj) {
        var selected = args[0],
            cfgSelected = DEF_CFG.SELECTED.key;
        
        if (selected) {
            if (Lang.isString(selected)) {
                this.cfg.setProperty(cfgSelected, this._parseDates(selected), true);
            } 
        }
        if (! this._selectedDates) {
            this._selectedDates = this.cfg.getProperty(cfgSelected);
        }
    },
    
    /**
    * The default handler for all configuration options properties
    * @method configOptions
    */
    configOptions : function(type, args, obj) {
        this.Options[type.toUpperCase()] = args[0];
    },

    /**
    * The default handler for all configuration locale properties
    * @method configLocale
    */
    configLocale : function(type, args, obj) {
        this.Locale[type.toUpperCase()] = args[0];

        this.cfg.refireEvent(DEF_CFG.LOCALE_MONTHS.key);
        this.cfg.refireEvent(DEF_CFG.LOCALE_WEEKDAYS.key);
    },
    
    /**
    * The default handler for all configuration locale field length properties
    * @method configLocaleValues
    */
    configLocaleValues : function(type, args, obj) {

        type = type.toLowerCase();

        var val = args[0],
            cfg = this.cfg,
            Locale = this.Locale;

        switch (type) {
            case DEF_CFG.LOCALE_MONTHS.key:
                switch (val) {
                    case Calendar.SHORT:
                        Locale.LOCALE_MONTHS = cfg.getProperty(DEF_CFG.MONTHS_SHORT.key).concat();
                        break;
                    case Calendar.LONG:
                        Locale.LOCALE_MONTHS = cfg.getProperty(DEF_CFG.MONTHS_LONG.key).concat();
                        break;
                }
                break;
            case DEF_CFG.LOCALE_WEEKDAYS.key:
                switch (val) {
                    case Calendar.ONE_CHAR:
                        Locale.LOCALE_WEEKDAYS = cfg.getProperty(DEF_CFG.WEEKDAYS_1CHAR.key).concat();
                        break;
                    case Calendar.SHORT:
                        Locale.LOCALE_WEEKDAYS = cfg.getProperty(DEF_CFG.WEEKDAYS_SHORT.key).concat();
                        break;
                    case Calendar.MEDIUM:
                        Locale.LOCALE_WEEKDAYS = cfg.getProperty(DEF_CFG.WEEKDAYS_MEDIUM.key).concat();
                        break;
                    case Calendar.LONG:
                        Locale.LOCALE_WEEKDAYS = cfg.getProperty(DEF_CFG.WEEKDAYS_LONG.key).concat();
                        break;
                }
                
                var START_WEEKDAY = cfg.getProperty(DEF_CFG.START_WEEKDAY.key);
    
                if (START_WEEKDAY > 0) {
                    for (var w=0; w < START_WEEKDAY; ++w) {
                        Locale.LOCALE_WEEKDAYS.push(Locale.LOCALE_WEEKDAYS.shift());
                    }
                }
                break;
        }
    },

    /**
     * The default handler for the "navigator" property
     * @method configNavigator
     */
    configNavigator : function(type, args, obj) {
        var val = args[0];
        if (YAHOO.widget.CalendarNavigator && (val === true || Lang.isObject(val))) {
            if (!this.oNavigator) {
                this.oNavigator = new YAHOO.widget.CalendarNavigator(this);
                // Cleanup DOM Refs/Events before innerHTML is removed.
                this.beforeRenderEvent.subscribe(function () {
                    if (!this.pages) {
                        this.oNavigator.erase();
                    }
                }, this, true);
            }
        } else {
            if (this.oNavigator) {
                this.oNavigator.destroy();
                this.oNavigator = null;
            }
        }
    },

    /**
    * Defines the style constants for the Calendar
    * @method initStyles
    */
    initStyles : function() {

        var defStyle = Calendar.STYLES;

        this.Style = {
            /**
            * @property Style.CSS_ROW_HEADER
            */
            CSS_ROW_HEADER: defStyle.CSS_ROW_HEADER,
            /**
            * @property Style.CSS_ROW_FOOTER
            */
            CSS_ROW_FOOTER: defStyle.CSS_ROW_FOOTER,
            /**
            * @property Style.CSS_CELL
            */
            CSS_CELL : defStyle.CSS_CELL,
            /**
            * @property Style.CSS_CELL_SELECTOR
            */
            CSS_CELL_SELECTOR : defStyle.CSS_CELL_SELECTOR,
            /**
            * @property Style.CSS_CELL_SELECTED
            */
            CSS_CELL_SELECTED : defStyle.CSS_CELL_SELECTED,
            /**
            * @property Style.CSS_CELL_SELECTABLE
            */
            CSS_CELL_SELECTABLE : defStyle.CSS_CELL_SELECTABLE,
            /**
            * @property Style.CSS_CELL_RESTRICTED
            */
            CSS_CELL_RESTRICTED : defStyle.CSS_CELL_RESTRICTED,
            /**
            * @property Style.CSS_CELL_TODAY
            */
            CSS_CELL_TODAY : defStyle.CSS_CELL_TODAY,
            /**
            * @property Style.CSS_CELL_OOM
            */
            CSS_CELL_OOM : defStyle.CSS_CELL_OOM,
            /**
            * @property Style.CSS_CELL_OOB
            */
            CSS_CELL_OOB : defStyle.CSS_CELL_OOB,
            /**
            * @property Style.CSS_HEADER
            */
            CSS_HEADER : defStyle.CSS_HEADER,
            /**
            * @property Style.CSS_HEADER_TEXT
            */
            CSS_HEADER_TEXT : defStyle.CSS_HEADER_TEXT,
            /**
            * @property Style.CSS_BODY
            */
            CSS_BODY : defStyle.CSS_BODY,
            /**
            * @property Style.CSS_WEEKDAY_CELL
            */
            CSS_WEEKDAY_CELL : defStyle.CSS_WEEKDAY_CELL,
            /**
            * @property Style.CSS_WEEKDAY_ROW
            */
            CSS_WEEKDAY_ROW : defStyle.CSS_WEEKDAY_ROW,
            /**
            * @property Style.CSS_FOOTER
            */
            CSS_FOOTER : defStyle.CSS_FOOTER,
            /**
            * @property Style.CSS_CALENDAR
            */
            CSS_CALENDAR : defStyle.CSS_CALENDAR,
            /**
            * @property Style.CSS_SINGLE
            */
            CSS_SINGLE : defStyle.CSS_SINGLE,
            /**
            * @property Style.CSS_CONTAINER
            */
            CSS_CONTAINER : defStyle.CSS_CONTAINER,
            /**
            * @property Style.CSS_NAV_LEFT
            */
            CSS_NAV_LEFT : defStyle.CSS_NAV_LEFT,
            /**
            * @property Style.CSS_NAV_RIGHT
            */
            CSS_NAV_RIGHT : defStyle.CSS_NAV_RIGHT,
            /**
            * @property Style.CSS_NAV
            */
            CSS_NAV : defStyle.CSS_NAV,
            /**
            * @property Style.CSS_CLOSE
            */
            CSS_CLOSE : defStyle.CSS_CLOSE,
            /**
            * @property Style.CSS_CELL_TOP
            */
            CSS_CELL_TOP : defStyle.CSS_CELL_TOP,
            /**
            * @property Style.CSS_CELL_LEFT
            */
            CSS_CELL_LEFT : defStyle.CSS_CELL_LEFT,
            /**
            * @property Style.CSS_CELL_RIGHT
            */
            CSS_CELL_RIGHT : defStyle.CSS_CELL_RIGHT,
            /**
            * @property Style.CSS_CELL_BOTTOM
            */
            CSS_CELL_BOTTOM : defStyle.CSS_CELL_BOTTOM,
            /**
            * @property Style.CSS_CELL_HOVER
            */
            CSS_CELL_HOVER : defStyle.CSS_CELL_HOVER,
            /**
            * @property Style.CSS_CELL_HIGHLIGHT1
            */
            CSS_CELL_HIGHLIGHT1 : defStyle.CSS_CELL_HIGHLIGHT1,
            /**
            * @property Style.CSS_CELL_HIGHLIGHT2
            */
            CSS_CELL_HIGHLIGHT2 : defStyle.CSS_CELL_HIGHLIGHT2,
            /**
            * @property Style.CSS_CELL_HIGHLIGHT3
            */
            CSS_CELL_HIGHLIGHT3 : defStyle.CSS_CELL_HIGHLIGHT3,
            /**
            * @property Style.CSS_CELL_HIGHLIGHT4
            */
            CSS_CELL_HIGHLIGHT4 : defStyle.CSS_CELL_HIGHLIGHT4,
            /**
             * @property Style.CSS_WITH_TITLE
             */
            CSS_WITH_TITLE : defStyle.CSS_WITH_TITLE,
             /**
             * @property Style.CSS_FIXED_SIZE
             */
            CSS_FIXED_SIZE : defStyle.CSS_FIXED_SIZE,
             /**
             * @property Style.CSS_LINK_CLOSE
             */
            CSS_LINK_CLOSE : defStyle.CSS_LINK_CLOSE
        };
    },

    /**
    * Builds the date label that will be displayed in the calendar header or
    * footer, depending on configuration.
    * @method buildMonthLabel
    * @return {String} The formatted calendar month label
    */
    buildMonthLabel : function() {
        return this._buildMonthLabel(this.cfg.getProperty(DEF_CFG.PAGEDATE.key));
    },

    /**
     * Helper method, to format a Month Year string, given a JavaScript Date, based on the 
     * Calendar localization settings
     * 
     * @method _buildMonthLabel
     * @private
     * @param {Date} date
     * @return {String} Formated month, year string
     */
    _buildMonthLabel : function(date) {
        var monthLabel  = this.Locale.LOCALE_MONTHS[date.getMonth()] + this.Locale.MY_LABEL_MONTH_SUFFIX,
            yearLabel = (date.getFullYear() + this.Locale.YEAR_OFFSET) + this.Locale.MY_LABEL_YEAR_SUFFIX;

        if (this.Locale.MY_LABEL_MONTH_POSITION == 2 || this.Locale.MY_LABEL_YEAR_POSITION == 1) {
            return yearLabel + monthLabel;
        } else {
            return monthLabel + yearLabel;
        }
    },
    
    /**
    * Builds the date digit that will be displayed in calendar cells
    * @method buildDayLabel
    * @param {Date} workingDate The current working date
    * @return {String} The formatted day label
    */
    buildDayLabel : function(workingDate) {
        return workingDate.getDate();
    },
    
    /**
     * Creates the title bar element and adds it to Calendar container DIV
     * 
     * @method createTitleBar
     * @param {String} strTitle The title to display in the title bar
     * @return The title bar element
     */
    createTitleBar : function(strTitle) {
        var tDiv = Dom.getElementsByClassName(YAHOO.widget.CalendarGroup.CSS_2UPTITLE, "div", this.oDomContainer)[0] || document.createElement("div");
        tDiv.className = YAHOO.widget.CalendarGroup.CSS_2UPTITLE;
        tDiv.innerHTML = strTitle;
        this.oDomContainer.insertBefore(tDiv, this.oDomContainer.firstChild);
    
        Dom.addClass(this.oDomContainer, this.Style.CSS_WITH_TITLE);
    
        return tDiv;
    },
    
    /**
     * Removes the title bar element from the DOM
     * 
     * @method removeTitleBar
     */
    removeTitleBar : function() {
        var tDiv = Dom.getElementsByClassName(YAHOO.widget.CalendarGroup.CSS_2UPTITLE, "div", this.oDomContainer)[0] || null;
        if (tDiv) {
            Event.purgeElement(tDiv);
            this.oDomContainer.removeChild(tDiv);
        }
        Dom.removeClass(this.oDomContainer, this.Style.CSS_WITH_TITLE);
    },
    
    /**
     * Creates the close button HTML element and adds it to Calendar container DIV
     * 
     * @method createCloseButton
     * @return The close HTML element created
     */
    createCloseButton : function() {
        var cssClose = YAHOO.widget.CalendarGroup.CSS_2UPCLOSE,
            cssLinkClose = this.Style.CSS_LINK_CLOSE,
            DEPR_CLOSE_PATH = "us/my/bn/x_d.gif",
            
            lnk = Dom.getElementsByClassName(cssLinkClose, "a", this.oDomContainer)[0],
            strings = this.cfg.getProperty(DEF_CFG.STRINGS.key),
            closeStr = (strings && strings.close) ? strings.close : "";

        if (!lnk) {
            lnk = document.createElement("a");
            Event.addListener(lnk, "click", function(e, cal) {
                cal.hide(); 
                Event.preventDefault(e);
            }, this);
        }

        lnk.href = "#";
        lnk.className = cssLinkClose;

        if (Calendar.IMG_ROOT !== null) {
            var img = Dom.getElementsByClassName(cssClose, "img", lnk)[0] || document.createElement("img");
            img.src = Calendar.IMG_ROOT + DEPR_CLOSE_PATH;
            img.className = cssClose;
            lnk.appendChild(img);
        } else {
            lnk.innerHTML = '<span class="' + cssClose + ' ' + this.Style.CSS_CLOSE + '">' + closeStr + '</span>';
        }
        this.oDomContainer.appendChild(lnk);

        return lnk;
    },
    
    /**
     * Removes the close button HTML element from the DOM
     * 
     * @method removeCloseButton
     */
    removeCloseButton : function() {
        var btn = Dom.getElementsByClassName(this.Style.CSS_LINK_CLOSE, "a", this.oDomContainer)[0] || null;
        if (btn) {
            Event.purgeElement(btn);
            this.oDomContainer.removeChild(btn);
        }
    },

    /**
    * Renders the calendar header.
    * @method renderHeader
    * @param {Array} html The current working HTML array
    * @return {Array} The current working HTML array
    */
    renderHeader : function(html) {

        this.logger.log("Rendering header", "render");

        var colSpan = 7,
            DEPR_NAV_LEFT = "us/tr/callt.gif",
            DEPR_NAV_RIGHT = "us/tr/calrt.gif",
            cfg = this.cfg,
            pageDate = cfg.getProperty(DEF_CFG.PAGEDATE.key),
            strings= cfg.getProperty(DEF_CFG.STRINGS.key),
            prevStr = (strings && strings.previousMonth) ?  strings.previousMonth : "",
            nextStr = (strings && strings.nextMonth) ? strings.nextMonth : "",
            monthLabel;

        if (cfg.getProperty(DEF_CFG.SHOW_WEEK_HEADER.key)) {
            colSpan += 1;
        }
    
        if (cfg.getProperty(DEF_CFG.SHOW_WEEK_FOOTER.key)) {
            colSpan += 1;
        }

        html[html.length] = "<thead>";
        html[html.length] =  "<tr>";
        html[html.length] =   '<th colspan="' + colSpan + '" class="' + this.Style.CSS_HEADER_TEXT + '">';
        html[html.length] =    '<div class="' + this.Style.CSS_HEADER + '">';

        var renderLeft, renderRight = false;

        if (this.parent) {
            if (this.index === 0) {
                renderLeft = true;
            }
            if (this.index == (this.parent.cfg.getProperty("pages") -1)) {
                renderRight = true;
            }
        } else {
            renderLeft = true;
            renderRight = true;
        }

        if (renderLeft) {
            monthLabel  = this._buildMonthLabel(DateMath.subtract(pageDate, DateMath.MONTH, 1));

            var leftArrow = cfg.getProperty(DEF_CFG.NAV_ARROW_LEFT.key);
            // Check for deprecated customization - If someone set IMG_ROOT, but didn't set NAV_ARROW_LEFT, then set NAV_ARROW_LEFT to the old deprecated value
            if (leftArrow === null && Calendar.IMG_ROOT !== null) {
                leftArrow = Calendar.IMG_ROOT + DEPR_NAV_LEFT;
            }
            var leftStyle = (leftArrow === null) ? "" : ' style="background-image:url(' + leftArrow + ')"';
            html[html.length] = '<a class="' + this.Style.CSS_NAV_LEFT + '"' + leftStyle + ' href="#">' + prevStr + ' (' + monthLabel + ')' + '</a>';
        }

        var lbl = this.buildMonthLabel();
        var cal = this.parent || this;
        if (cal.cfg.getProperty("navigator")) {
            lbl = "<a class=\"" + this.Style.CSS_NAV + "\" href=\"#\">" + lbl + "</a>";
        }
        html[html.length] = lbl;

        if (renderRight) {
            monthLabel  = this._buildMonthLabel(DateMath.add(pageDate, DateMath.MONTH, 1));

            var rightArrow = cfg.getProperty(DEF_CFG.NAV_ARROW_RIGHT.key);
            if (rightArrow === null && Calendar.IMG_ROOT !== null) {
                rightArrow = Calendar.IMG_ROOT + DEPR_NAV_RIGHT;
            }
            var rightStyle = (rightArrow === null) ? "" : ' style="background-image:url(' + rightArrow + ')"';
            html[html.length] = '<a class="' + this.Style.CSS_NAV_RIGHT + '"' + rightStyle + ' href="#">' + nextStr + ' (' + monthLabel + ')' + '</a>';
        }

        html[html.length] = '</div>\n</th>\n</tr>';

        if (cfg.getProperty(DEF_CFG.SHOW_WEEKDAYS.key)) {
            html = this.buildWeekdays(html);
        }
        
        html[html.length] = '</thead>';
    
        return html;
    },
    
    /**
    * Renders the Calendar's weekday headers.
    * @method buildWeekdays
    * @param {Array} html The current working HTML array
    * @return {Array} The current working HTML array
    */
    buildWeekdays : function(html) {

        html[html.length] = '<tr class="' + this.Style.CSS_WEEKDAY_ROW + '">';

        if (this.cfg.getProperty(DEF_CFG.SHOW_WEEK_HEADER.key)) {
            html[html.length] = '<th>&#160;</th>';
        }

        for(var i=0;i < this.Locale.LOCALE_WEEKDAYS.length; ++i) {
            html[html.length] = '<th class="' + this.Style.CSS_WEEKDAY_CELL + '">' + this.Locale.LOCALE_WEEKDAYS[i] + '</th>';
        }

        if (this.cfg.getProperty(DEF_CFG.SHOW_WEEK_FOOTER.key)) {
            html[html.length] = '<th>&#160;</th>';
        }

        html[html.length] = '</tr>';

        return html;
    },
    
    /**
    * Renders the calendar body.
    * @method renderBody
    * @param {Date} workingDate The current working Date being used for the render process
    * @param {Array} html The current working HTML array
    * @return {Array} The current working HTML array
    */
    renderBody : function(workingDate, html) {
        this.logger.log("Rendering body", "render");

        var startDay = this.cfg.getProperty(DEF_CFG.START_WEEKDAY.key);

        this.preMonthDays = workingDate.getDay();
        if (startDay > 0) {
            this.preMonthDays -= startDay;
        }
        if (this.preMonthDays < 0) {
            this.preMonthDays += 7;
        }

        this.monthDays = DateMath.findMonthEnd(workingDate).getDate();
        this.postMonthDays = Calendar.DISPLAY_DAYS-this.preMonthDays-this.monthDays;

        this.logger.log(this.preMonthDays + " preciding out-of-month days", "render");
        this.logger.log(this.monthDays + " month days", "render");
        this.logger.log(this.postMonthDays + " post-month days", "render");

        workingDate = DateMath.subtract(workingDate, DateMath.DAY, this.preMonthDays);
        this.logger.log("Calendar page starts on " + workingDate, "render");
    
        var weekNum,
            weekClass,
            weekPrefix = "w",
            cellPrefix = "_cell",
            workingDayPrefix = "wd",
            dayPrefix = "d",
            cellRenderers,
            renderer,
            t = this.today,
            cfg = this.cfg,
            todayYear = t.getFullYear(),
            todayMonth = t.getMonth(),
            todayDate = t.getDate(),
            useDate = cfg.getProperty(DEF_CFG.PAGEDATE.key),
            hideBlankWeeks = cfg.getProperty(DEF_CFG.HIDE_BLANK_WEEKS.key),
            showWeekFooter = cfg.getProperty(DEF_CFG.SHOW_WEEK_FOOTER.key),
            showWeekHeader = cfg.getProperty(DEF_CFG.SHOW_WEEK_HEADER.key),
            mindate = cfg.getProperty(DEF_CFG.MINDATE.key),
            maxdate = cfg.getProperty(DEF_CFG.MAXDATE.key),
            yearOffset = this.Locale.YEAR_OFFSET;

        if (mindate) {
            mindate = DateMath.clearTime(mindate);
        }
        if (maxdate) {
            maxdate = DateMath.clearTime(maxdate);
        }

        html[html.length] = '<tbody class="m' + (useDate.getMonth()+1) + ' ' + this.Style.CSS_BODY + '">';

        var i = 0,
            tempDiv = document.createElement("div"),
            cell = document.createElement("td");

        tempDiv.appendChild(cell);

        var cal = this.parent || this;

        for (var r=0;r<6;r++) {
            weekNum = DateMath.getWeekNumber(workingDate, startDay);
            weekClass = weekPrefix + weekNum;

            // Local OOM check for performance, since we already have pagedate
            if (r !== 0 && hideBlankWeeks === true && workingDate.getMonth() != useDate.getMonth()) {
                break;
            } else {
                html[html.length] = '<tr class="' + weekClass + '">';

                if (showWeekHeader) { html = this.renderRowHeader(weekNum, html); }

                for (var d=0; d < 7; d++){ // Render actual days

                    cellRenderers = [];

                    this.clearElement(cell);
                    cell.className = this.Style.CSS_CELL;
                    cell.id = this.id + cellPrefix + i;
                    this.logger.log("Rendering cell " + cell.id + " (" + workingDate.getFullYear() + yearOffset + "-" + (workingDate.getMonth()+1) + "-" + workingDate.getDate() + ")", "cellrender");

                    if (workingDate.getDate()  == todayDate && 
                        workingDate.getMonth()  == todayMonth &&
                        workingDate.getFullYear() == todayYear) {
                        cellRenderers[cellRenderers.length]=cal.renderCellStyleToday;
                    }

                    var workingArray = [workingDate.getFullYear(),workingDate.getMonth()+1,workingDate.getDate()];
                    this.cellDates[this.cellDates.length] = workingArray; // Add this date to cellDates

                    // Local OOM check for performance, since we already have pagedate
                    if (workingDate.getMonth() != useDate.getMonth()) {
                        cellRenderers[cellRenderers.length]=cal.renderCellNotThisMonth;
                    } else {
                        Dom.addClass(cell, workingDayPrefix + workingDate.getDay());
                        Dom.addClass(cell, dayPrefix + workingDate.getDate());

                        for (var s=0;s<this.renderStack.length;++s) {

                            renderer = null;

                            var rArray = this.renderStack[s],
                                type = rArray[0],
                                month,
                                day,
                                year;

                            switch (type) {
                                case Calendar.DATE:
                                    month = rArray[1][1];
                                    day = rArray[1][2];
                                    year = rArray[1][0];

                                    if (workingDate.getMonth()+1 == month && workingDate.getDate() == day && workingDate.getFullYear() == year) {
                                        renderer = rArray[2];
                                        this.renderStack.splice(s,1);
                                    }
                                    break;
                                case Calendar.MONTH_DAY:
                                    month = rArray[1][0];
                                    day = rArray[1][1];

                                    if (workingDate.getMonth()+1 == month && workingDate.getDate() == day) {
                                        renderer = rArray[2];
                                        this.renderStack.splice(s,1);
                                    }
                                    break;
                                case Calendar.RANGE:
                                    var date1 = rArray[1][0],
                                        date2 = rArray[1][1],
                                        d1month = date1[1],
                                        d1day = date1[2],
                                        d1year = date1[0],
                                        d1 = DateMath.getDate(d1year, d1month-1, d1day),
                                        d2month = date2[1],
                                        d2day = date2[2],
                                        d2year = date2[0],
                                        d2 = DateMath.getDate(d2year, d2month-1, d2day);

                                    if (workingDate.getTime() >= d1.getTime() && workingDate.getTime() <= d2.getTime()) {
                                        renderer = rArray[2];

                                        if (workingDate.getTime()==d2.getTime()) { 
                                            this.renderStack.splice(s,1);
                                        }
                                    }
                                    break;
                                case Calendar.WEEKDAY:
                                    var weekday = rArray[1][0];
                                    if (workingDate.getDay()+1 == weekday) {
                                        renderer = rArray[2];
                                    }
                                    break;
                                case Calendar.MONTH:
                                    month = rArray[1][0];
                                    if (workingDate.getMonth()+1 == month) {
                                        renderer = rArray[2];
                                    }
                                    break;
                            }

                            if (renderer) {
                                cellRenderers[cellRenderers.length]=renderer;
                            }
                        }

                    }

                    if (this._indexOfSelectedFieldArray(workingArray) > -1) {
                        cellRenderers[cellRenderers.length]=cal.renderCellStyleSelected; 
                    }

                    if ((mindate && (workingDate.getTime() < mindate.getTime())) ||
                        (maxdate && (workingDate.getTime() > maxdate.getTime()))
                    ) {
                        cellRenderers[cellRenderers.length]=cal.renderOutOfBoundsDate;
                    } else {
                        cellRenderers[cellRenderers.length]=cal.styleCellDefault;
                        cellRenderers[cellRenderers.length]=cal.renderCellDefault; 
                    }

                    for (var x=0; x < cellRenderers.length; ++x) {
                        this.logger.log("renderer[" + x + "] for (" + workingDate.getFullYear() + yearOffset + "-" + (workingDate.getMonth()+1) + "-" + workingDate.getDate() + ")", "cellrender");
                        if (cellRenderers[x].call(cal, workingDate, cell) == Calendar.STOP_RENDER) {
                            break;
                        }
                    }

                    workingDate.setTime(workingDate.getTime() + DateMath.ONE_DAY_MS);
                    // Just in case we crossed DST/Summertime boundaries
                    workingDate = DateMath.clearTime(workingDate);

                    if (i >= 0 && i <= 6) {
                        Dom.addClass(cell, this.Style.CSS_CELL_TOP);
                    }
                    if ((i % 7) === 0) {
                        Dom.addClass(cell, this.Style.CSS_CELL_LEFT);
                    }
                    if (((i+1) % 7) === 0) {
                        Dom.addClass(cell, this.Style.CSS_CELL_RIGHT);
                    }

                    var postDays = this.postMonthDays; 
                    if (hideBlankWeeks && postDays >= 7) {
                        var blankWeeks = Math.floor(postDays/7);
                        for (var p=0;p<blankWeeks;++p) {
                            postDays -= 7;
                        }
                    }
                    
                    if (i >= ((this.preMonthDays+postDays+this.monthDays)-7)) {
                        Dom.addClass(cell, this.Style.CSS_CELL_BOTTOM);
                    }
    
                    html[html.length] = tempDiv.innerHTML;
                    i++;
                }
    
                if (showWeekFooter) { html = this.renderRowFooter(weekNum, html); }
    
                html[html.length] = '</tr>';
            }
        }
    
        html[html.length] = '</tbody>';
    
        return html;
    },
    
    /**
    * Renders the calendar footer. In the default implementation, there is
    * no footer.
    * @method renderFooter
    * @param {Array} html The current working HTML array
    * @return {Array} The current working HTML array
    */
    renderFooter : function(html) { return html; },
    
    /**
    * Renders the calendar after it has been configured. The render() method has a specific call chain that will execute
    * when the method is called: renderHeader, renderBody, renderFooter.
    * Refer to the documentation for those methods for information on 
    * individual render tasks.
    * @method render
    */
    render : function() {
        this.beforeRenderEvent.fire();

        // Find starting day of the current month
        var workingDate = DateMath.findMonthStart(this.cfg.getProperty(DEF_CFG.PAGEDATE.key));

        this.resetRenderers();
        this.cellDates.length = 0;

        Event.purgeElement(this.oDomContainer, true);

        var html = [];

        html[html.length] = '<table cellSpacing="0" class="' + this.Style.CSS_CALENDAR + ' y' + (workingDate.getFullYear() + this.Locale.YEAR_OFFSET) +'" id="' + this.id + '">';
        html = this.renderHeader(html);
        html = this.renderBody(workingDate, html);
        html = this.renderFooter(html);
        html[html.length] = '</table>';

        this.oDomContainer.innerHTML = html.join("\n");

        this.applyListeners();
        this.cells = Dom.getElementsByClassName(this.Style.CSS_CELL, "td", this.id);
    
        this.cfg.refireEvent(DEF_CFG.TITLE.key);
        this.cfg.refireEvent(DEF_CFG.CLOSE.key);
        this.cfg.refireEvent(DEF_CFG.IFRAME.key);

        this.renderEvent.fire();
    },

    /**
    * Applies the Calendar's DOM listeners to applicable elements.
    * @method applyListeners
    */
    applyListeners : function() {
        var root = this.oDomContainer,
            cal = this.parent || this,
            anchor = "a",
            click = "click";

        var linkLeft = Dom.getElementsByClassName(this.Style.CSS_NAV_LEFT, anchor, root),
            linkRight = Dom.getElementsByClassName(this.Style.CSS_NAV_RIGHT, anchor, root);

        if (linkLeft && linkLeft.length > 0) {
            this.linkLeft = linkLeft[0];
            Event.addListener(this.linkLeft, click, this.doPreviousMonthNav, cal, true);
        }

        if (linkRight && linkRight.length > 0) {
            this.linkRight = linkRight[0];
            Event.addListener(this.linkRight, click, this.doNextMonthNav, cal, true);
        }

        if (cal.cfg.getProperty("navigator") !== null) {
            this.applyNavListeners();
        }

        if (this.domEventMap) {
            var el,elements;
            for (var cls in this.domEventMap) { 
                if (Lang.hasOwnProperty(this.domEventMap, cls)) {
                    var items = this.domEventMap[cls];
    
                    if (! (items instanceof Array)) {
                        items = [items];
                    }
    
                    for (var i=0;i<items.length;i++) {
                        var item = items[i];
                        elements = Dom.getElementsByClassName(cls, item.tag, this.oDomContainer);
    
                        for (var c=0;c<elements.length;c++) {
                            el = elements[c];
                             Event.addListener(el, item.event, item.handler, item.scope, item.correct );
                        }
                    }
                }
            }
        }

        Event.addListener(this.oDomContainer, "click", this.doSelectCell, this);
        Event.addListener(this.oDomContainer, "mouseover", this.doCellMouseOver, this);
        Event.addListener(this.oDomContainer, "mouseout", this.doCellMouseOut, this);
    },

    applyNavListeners : function() {
        var calParent = this.parent || this,
            cal = this,
            navBtns = Dom.getElementsByClassName(this.Style.CSS_NAV, "a", this.oDomContainer);

        if (navBtns.length > 0) {

            Event.addListener(navBtns, "click", function (e, obj) {
                var target = Event.getTarget(e);
                // this == navBtn
                if (this === target || Dom.isAncestor(this, target)) {
                    Event.preventDefault(e);
                }
                var navigator = calParent.oNavigator;
                if (navigator) {
                    var pgdate = cal.cfg.getProperty("pagedate");
                    navigator.setYear(pgdate.getFullYear() + cal.Locale.YEAR_OFFSET);
                    navigator.setMonth(pgdate.getMonth());
                    navigator.show();
                }
            });
        }
    },

    /**
    * Retrieves the Date object for the specified Calendar cell
    * @method getDateByCellId
    * @param {String} id The id of the cell
    * @return {Date} The Date object for the specified Calendar cell
    */
    getDateByCellId : function(id) {
        var date = this.getDateFieldsByCellId(id);
        return (date) ? DateMath.getDate(date[0],date[1]-1,date[2]) : null;
    },
    
    /**
    * Retrieves the Date object for the specified Calendar cell
    * @method getDateFieldsByCellId
    * @param {String} id The id of the cell
    * @return {Array} The array of Date fields for the specified Calendar cell
    */
    getDateFieldsByCellId : function(id) {
        id = this.getIndexFromId(id);
        return (id > -1) ? this.cellDates[id] : null;
    },

    /**
     * Find the Calendar's cell index for a given date.
     * If the date is not found, the method returns -1.
     * <p>
     * The returned index can be used to lookup the cell HTMLElement  
     * using the Calendar's cells array or passed to selectCell to select 
     * cells by index. 
     * </p>
     *
     * See <a href="#cells">cells</a>, <a href="#selectCell">selectCell</a>.
     *
     * @method getCellIndex
     * @param {Date} date JavaScript Date object, for which to find a cell index.
     * @return {Number} The index of the date in Calendars cellDates/cells arrays, or -1 if the date 
     * is not on the curently rendered Calendar page.
     */
    getCellIndex : function(date) {
        var idx = -1;
        if (date) {
            var m = date.getMonth(),
                y = date.getFullYear(),
                d = date.getDate(),
                dates = this.cellDates;

            for (var i = 0; i < dates.length; ++i) {
                var cellDate = dates[i];
                if (cellDate[0] === y && cellDate[1] === m+1 && cellDate[2] === d) {
                    idx = i;
                    break;
                }
            }
        }
        return idx;
    },

    /**
     * Given the id used to mark each Calendar cell, this method
     * extracts the index number from the id.
     * 
     * @param {String} strId The cell id
     * @return {Number} The index of the cell, or -1 if id does not contain an index number
     */
    getIndexFromId : function(strId) {
        var idx = -1,
            li = strId.lastIndexOf("_cell");

        if (li > -1) {
            idx = parseInt(strId.substring(li + 5), 10);
        }

        return idx;
    },
    
    // BEGIN BUILT-IN TABLE CELL RENDERERS
    
    /**
    * Renders a cell that falls before the minimum date or after the maximum date.
    * widget class.
    * @method renderOutOfBoundsDate
    * @param {Date}     workingDate  The current working Date object being used to generate the calendar
    * @param {HTMLTableCellElement} cell   The current working cell in the calendar
    * @return {String} YAHOO.widget.Calendar.STOP_RENDER if rendering should stop with this style, null or nothing if rendering
    *   should not be terminated
    */
    renderOutOfBoundsDate : function(workingDate, cell) {
        Dom.addClass(cell, this.Style.CSS_CELL_OOB);
        cell.innerHTML = workingDate.getDate();
        return Calendar.STOP_RENDER;
    },

    /**
    * Renders the row header for a week.
    * @method renderRowHeader
    * @param {Number} weekNum The week number of the current row
    * @param {Array} cell The current working HTML array
    */
    renderRowHeader : function(weekNum, html) {
        html[html.length] = '<th class="' + this.Style.CSS_ROW_HEADER + '">' + weekNum + '</th>';
        return html;
    },

    /**
    * Renders the row footer for a week.
    * @method renderRowFooter
    * @param {Number} weekNum The week number of the current row
    * @param {Array} cell The current working HTML array
    */
    renderRowFooter : function(weekNum, html) {
        html[html.length] = '<th class="' + this.Style.CSS_ROW_FOOTER + '">' + weekNum + '</th>';
        return html;
    },
    
    /**
    * Renders a single standard calendar cell in the calendar widget table.
    * All logic for determining how a standard default cell will be rendered is 
    * encapsulated in this method, and must be accounted for when extending the
    * widget class.
    * @method renderCellDefault
    * @param {Date}     workingDate  The current working Date object being used to generate the calendar
    * @param {HTMLTableCellElement} cell   The current working cell in the calendar
    */
    renderCellDefault : function(workingDate, cell) {
        cell.innerHTML = '<a href="#" class="' + this.Style.CSS_CELL_SELECTOR + '">' + this.buildDayLabel(workingDate) + "</a>";
    },
    
    /**
    * Styles a selectable cell.
    * @method styleCellDefault
    * @param {Date}     workingDate  The current working Date object being used to generate the calendar
    * @param {HTMLTableCellElement} cell   The current working cell in the calendar
    */
    styleCellDefault : function(workingDate, cell) {
        Dom.addClass(cell, this.Style.CSS_CELL_SELECTABLE);
    },
    
    
    /**
    * Renders a single standard calendar cell using the CSS hightlight1 style
    * @method renderCellStyleHighlight1
    * @param {Date}     workingDate  The current working Date object being used to generate the calendar
    * @param {HTMLTableCellElement} cell   The current working cell in the calendar
    */
    renderCellStyleHighlight1 : function(workingDate, cell) {
        Dom.addClass(cell, this.Style.CSS_CELL_HIGHLIGHT1);
    },
    
    /**
    * Renders a single standard calendar cell using the CSS hightlight2 style
    * @method renderCellStyleHighlight2
    * @param {Date}     workingDate  The current working Date object being used to generate the calendar
    * @param {HTMLTableCellElement} cell   The current working cell in the calendar
    */
    renderCellStyleHighlight2 : function(workingDate, cell) {
        Dom.addClass(cell, this.Style.CSS_CELL_HIGHLIGHT2);
    },
    
    /**
    * Renders a single standard calendar cell using the CSS hightlight3 style
    * @method renderCellStyleHighlight3
    * @param {Date}     workingDate  The current working Date object being used to generate the calendar
    * @param {HTMLTableCellElement} cell   The current working cell in the calendar
    */
    renderCellStyleHighlight3 : function(workingDate, cell) {
        Dom.addClass(cell, this.Style.CSS_CELL_HIGHLIGHT3);
    },
    
    /**
    * Renders a single standard calendar cell using the CSS hightlight4 style
    * @method renderCellStyleHighlight4
    * @param {Date}     workingDate  The current working Date object being used to generate the calendar
    * @param {HTMLTableCellElement} cell   The current working cell in the calendar
    */
    renderCellStyleHighlight4 : function(workingDate, cell) {
        Dom.addClass(cell, this.Style.CSS_CELL_HIGHLIGHT4);
    },
    
    /**
    * Applies the default style used for rendering today's date to the current calendar cell
    * @method renderCellStyleToday
    * @param {Date}     workingDate  The current working Date object being used to generate the calendar
    * @param {HTMLTableCellElement} cell   The current working cell in the calendar
    */
    renderCellStyleToday : function(workingDate, cell) {
        Dom.addClass(cell, this.Style.CSS_CELL_TODAY);
    },

    /**
    * Applies the default style used for rendering selected dates to the current calendar cell
    * @method renderCellStyleSelected
    * @param {Date}     workingDate  The current working Date object being used to generate the calendar
    * @param {HTMLTableCellElement} cell   The current working cell in the calendar
    * @return {String} YAHOO.widget.Calendar.STOP_RENDER if rendering should stop with this style, null or nothing if rendering
    *   should not be terminated
    */
    renderCellStyleSelected : function(workingDate, cell) {
        Dom.addClass(cell, this.Style.CSS_CELL_SELECTED);
    },
    
    /**
    * Applies the default style used for rendering dates that are not a part of the current
    * month (preceding or trailing the cells for the current month)
    * @method renderCellNotThisMonth
    * @param {Date}     workingDate  The current working Date object being used to generate the calendar
    * @param {HTMLTableCellElement} cell   The current working cell in the calendar
    * @return {String} YAHOO.widget.Calendar.STOP_RENDER if rendering should stop with this style, null or nothing if rendering
    *   should not be terminated
    */
    renderCellNotThisMonth : function(workingDate, cell) {
        Dom.addClass(cell, this.Style.CSS_CELL_OOM);
        cell.innerHTML=workingDate.getDate();
        return Calendar.STOP_RENDER;
    },
    
    /**
    * Renders the current calendar cell as a non-selectable "black-out" date using the default
    * restricted style.
    * @method renderBodyCellRestricted
    * @param {Date}     workingDate  The current working Date object being used to generate the calendar
    * @param {HTMLTableCellElement} cell   The current working cell in the calendar
    * @return {String} YAHOO.widget.Calendar.STOP_RENDER if rendering should stop with this style, null or nothing if rendering
    *   should not be terminated
    */
    renderBodyCellRestricted : function(workingDate, cell) {
        Dom.addClass(cell, this.Style.CSS_CELL);
        Dom.addClass(cell, this.Style.CSS_CELL_RESTRICTED);
        cell.innerHTML=workingDate.getDate();
        return Calendar.STOP_RENDER;
    },
    
    // END BUILT-IN TABLE CELL RENDERERS
    
    // BEGIN MONTH NAVIGATION METHODS

    /**
    * Adds the designated number of months to the current calendar month, and sets the current
    * calendar page date to the new month.
    * @method addMonths
    * @param {Number} count The number of months to add to the current calendar
    */
    addMonths : function(count) {
        var cfgPageDate = DEF_CFG.PAGEDATE.key,

        prevDate = this.cfg.getProperty(cfgPageDate),
        newDate = DateMath.add(prevDate, DateMath.MONTH, count);

        this.cfg.setProperty(cfgPageDate, newDate);
        this.resetRenderers();
        this.changePageEvent.fire(prevDate, newDate);
    },

    /**
    * Subtracts the designated number of months from the current calendar month, and sets the current
    * calendar page date to the new month.
    * @method subtractMonths
    * @param {Number} count The number of months to subtract from the current calendar
    */
    subtractMonths : function(count) {
        this.addMonths(-1*count);
    },

    /**
    * Adds the designated number of years to the current calendar, and sets the current
    * calendar page date to the new month.
    * @method addYears
    * @param {Number} count The number of years to add to the current calendar
    */
    addYears : function(count) {
        var cfgPageDate = DEF_CFG.PAGEDATE.key,

        prevDate = this.cfg.getProperty(cfgPageDate),
        newDate = DateMath.add(prevDate, DateMath.YEAR, count);

        this.cfg.setProperty(cfgPageDate, newDate);
        this.resetRenderers();
        this.changePageEvent.fire(prevDate, newDate);
    },

    /**
    * Subtcats the designated number of years from the current calendar, and sets the current
    * calendar page date to the new month.
    * @method subtractYears
    * @param {Number} count The number of years to subtract from the current calendar
    */
    subtractYears : function(count) {
        this.addYears(-1*count);
    },

    /**
    * Navigates to the next month page in the calendar widget.
    * @method nextMonth
    */
    nextMonth : function() {
        this.addMonths(1);
    },
    
    /**
    * Navigates to the previous month page in the calendar widget.
    * @method previousMonth
    */
    previousMonth : function() {
        this.addMonths(-1);
    },
    
    /**
    * Navigates to the next year in the currently selected month in the calendar widget.
    * @method nextYear
    */
    nextYear : function() {
        this.addYears(1);
    },
    
    /**
    * Navigates to the previous year in the currently selected month in the calendar widget.
    * @method previousYear
    */
    previousYear : function() {
        this.addYears(-1);
    },

    // END MONTH NAVIGATION METHODS
    
    // BEGIN SELECTION METHODS
    
    /**
    * Resets the calendar widget to the originally selected month and year, and 
    * sets the calendar to the initial selection(s).
    * @method reset
    */
    reset : function() {
        this.cfg.resetProperty(DEF_CFG.SELECTED.key);
        this.cfg.resetProperty(DEF_CFG.PAGEDATE.key);
        this.resetEvent.fire();
    },
    
    /**
    * Clears the selected dates in the current calendar widget and sets the calendar
    * to the current month and year.
    * @method clear
    */
    clear : function() {
        this.cfg.setProperty(DEF_CFG.SELECTED.key, []);
        this.cfg.setProperty(DEF_CFG.PAGEDATE.key, new Date(this.today.getTime()));
        this.clearEvent.fire();
    },
    
    /**
    * Selects a date or a collection of dates on the current calendar. This method, by default,
    * does not call the render method explicitly. Once selection has completed, render must be 
    * called for the changes to be reflected visually.
    *
    * Any dates which are OOB (out of bounds, not selectable) will not be selected and the array of 
    * selected dates passed to the selectEvent will not contain OOB dates.
    * 
    * If all dates are OOB, the no state change will occur; beforeSelect and select events will not be fired.
    *
    * @method select
    * @param {String/Date/Date[]} date The date string of dates to select in the current calendar. Valid formats are
    *        individual date(s) (12/24/2005,12/26/2005) or date range(s) (12/24/2005-1/1/2006).
    *        Multiple comma-delimited dates can also be passed to this method (12/24/2005,12/11/2005-12/13/2005).
    *        This method can also take a JavaScript Date object or an array of Date objects.
    * @return {Date[]}   Array of JavaScript Date objects representing all individual dates that are currently selected.
    */
    select : function(date) {
        this.logger.log("Select: " + date, "info");

        var aToBeSelected = this._toFieldArray(date),
            validDates = [],
            selected = [],
            cfgSelected = DEF_CFG.SELECTED.key;

        this.logger.log("Selection field array: " + aToBeSelected, "info");
        
        for (var a=0; a < aToBeSelected.length; ++a) {
            var toSelect = aToBeSelected[a];

            if (!this.isDateOOB(this._toDate(toSelect))) {

                if (validDates.length === 0) {
                    this.beforeSelectEvent.fire();
                    selected = this.cfg.getProperty(cfgSelected);
                }
                validDates.push(toSelect);

                if (this._indexOfSelectedFieldArray(toSelect) == -1) { 
                    selected[selected.length] = toSelect;
                }
            }
        }

        if (validDates.length === 0) { this.logger.log("All provided dates were OOB. beforeSelect and select events not fired", "info"); }

        if (validDates.length > 0) {
            if (this.parent) {
                this.parent.cfg.setProperty(cfgSelected, selected);
            } else {
                this.cfg.setProperty(cfgSelected, selected);
            }
            this.selectEvent.fire(validDates);
        }

        return this.getSelectedDates();
    },
    
    /**
    * Selects a date on the current calendar by referencing the index of the cell that should be selected.
    * This method is used to easily select a single cell (usually with a mouse click) without having to do
    * a full render. The selected style is applied to the cell directly.
    *
    * If the cell is not marked with the CSS_CELL_SELECTABLE class (as is the case by default for out of month 
    * or out of bounds cells), it will not be selected and in such a case beforeSelect and select events will not be fired.
    * 
    * @method selectCell
    * @param {Number} cellIndex The index of the cell to select in the current calendar. 
    * @return {Date[]} Array of JavaScript Date objects representing all individual dates that are currently selected.
    */
    selectCell : function(cellIndex) {

        var cell = this.cells[cellIndex],
            cellDate = this.cellDates[cellIndex],
            dCellDate = this._toDate(cellDate),
            selectable = Dom.hasClass(cell, this.Style.CSS_CELL_SELECTABLE);

        this.logger.log("Select: " + dCellDate, "info");
        if (!selectable) {this.logger.log("The cell at cellIndex:" + cellIndex + " is not a selectable cell. beforeSelect, select events not fired", "info"); }

        if (selectable) {
    
            this.beforeSelectEvent.fire();
    
            var cfgSelected = DEF_CFG.SELECTED.key;
            var selected = this.cfg.getProperty(cfgSelected);
    
            var selectDate = cellDate.concat();
    
            if (this._indexOfSelectedFieldArray(selectDate) == -1) {
                selected[selected.length] = selectDate;
            }
            if (this.parent) {
                this.parent.cfg.setProperty(cfgSelected, selected);
            } else {
                this.cfg.setProperty(cfgSelected, selected);
            }
            this.renderCellStyleSelected(dCellDate,cell);
            this.selectEvent.fire([selectDate]);
    
            this.doCellMouseOut.call(cell, null, this);  
        }
    
        return this.getSelectedDates();
    },
    
    /**
    * Deselects a date or a collection of dates on the current calendar. This method, by default,
    * does not call the render method explicitly. Once deselection has completed, render must be 
    * called for the changes to be reflected visually.
    * 
    * The method will not attempt to deselect any dates which are OOB (out of bounds, and hence not selectable) 
    * and the array of deselected dates passed to the deselectEvent will not contain any OOB dates.
    * 
    * If all dates are OOB, beforeDeselect and deselect events will not be fired.
    * 
    * @method deselect
    * @param {String/Date/Date[]} date The date string of dates to deselect in the current calendar. Valid formats are
    *        individual date(s) (12/24/2005,12/26/2005) or date range(s) (12/24/2005-1/1/2006).
    *        Multiple comma-delimited dates can also be passed to this method (12/24/2005,12/11/2005-12/13/2005).
    *        This method can also take a JavaScript Date object or an array of Date objects. 
    * @return {Date[]}   Array of JavaScript Date objects representing all individual dates that are currently selected.
    */
    deselect : function(date) {
        this.logger.log("Deselect: " + date, "info");

        var aToBeDeselected = this._toFieldArray(date),
            validDates = [],
            selected = [],
            cfgSelected = DEF_CFG.SELECTED.key;

        this.logger.log("Deselection field array: " + aToBeDeselected, "info");

        for (var a=0; a < aToBeDeselected.length; ++a) {
            var toDeselect = aToBeDeselected[a];
    
            if (!this.isDateOOB(this._toDate(toDeselect))) {
    
                if (validDates.length === 0) {
                    this.beforeDeselectEvent.fire();
                    selected = this.cfg.getProperty(cfgSelected);
                }
    
                validDates.push(toDeselect);
    
                var index = this._indexOfSelectedFieldArray(toDeselect);
                if (index != -1) { 
                    selected.splice(index,1);
                }
            }
        }
    
        if (validDates.length === 0) { this.logger.log("All provided dates were OOB. beforeDeselect and deselect events not fired");}
    
        if (validDates.length > 0) {
            if (this.parent) {
                this.parent.cfg.setProperty(cfgSelected, selected);
            } else {
                this.cfg.setProperty(cfgSelected, selected);
            }
            this.deselectEvent.fire(validDates);
        }
    
        return this.getSelectedDates();
    },
    
    /**
    * Deselects a date on the current calendar by referencing the index of the cell that should be deselected.
    * This method is used to easily deselect a single cell (usually with a mouse click) without having to do
    * a full render. The selected style is removed from the cell directly.
    * 
    * If the cell is not marked with the CSS_CELL_SELECTABLE class (as is the case by default for out of month 
    * or out of bounds cells), the method will not attempt to deselect it and in such a case, beforeDeselect and 
    * deselect events will not be fired.
    * 
    * @method deselectCell
    * @param {Number} cellIndex The index of the cell to deselect in the current calendar. 
    * @return {Date[]} Array of JavaScript Date objects representing all individual dates that are currently selected.
    */
    deselectCell : function(cellIndex) {
        var cell = this.cells[cellIndex],
            cellDate = this.cellDates[cellIndex],
            cellDateIndex = this._indexOfSelectedFieldArray(cellDate);

        var selectable = Dom.hasClass(cell, this.Style.CSS_CELL_SELECTABLE);
        if (!selectable) { this.logger.log("The cell at cellIndex:" + cellIndex + " is not a selectable/deselectable cell", "info"); }

        if (selectable) {

            this.beforeDeselectEvent.fire();

            var selected = this.cfg.getProperty(DEF_CFG.SELECTED.key),
                dCellDate = this._toDate(cellDate),
                selectDate = cellDate.concat();

            if (cellDateIndex > -1) {
                if (this.cfg.getProperty(DEF_CFG.PAGEDATE.key).getMonth() == dCellDate.getMonth() &&
                    this.cfg.getProperty(DEF_CFG.PAGEDATE.key).getFullYear() == dCellDate.getFullYear()) {
                    Dom.removeClass(cell, this.Style.CSS_CELL_SELECTED);
                }
                selected.splice(cellDateIndex, 1);
            }

            if (this.parent) {
                this.parent.cfg.setProperty(DEF_CFG.SELECTED.key, selected);
            } else {
                this.cfg.setProperty(DEF_CFG.SELECTED.key, selected);
            }

            this.deselectEvent.fire([selectDate]);
        }

        return this.getSelectedDates();
    },

    /**
    * Deselects all dates on the current calendar.
    * @method deselectAll
    * @return {Date[]}  Array of JavaScript Date objects representing all individual dates that are currently selected.
    *      Assuming that this function executes properly, the return value should be an empty array.
    *      However, the empty array is returned for the sake of being able to check the selection status
    *      of the calendar.
    */
    deselectAll : function() {
        this.beforeDeselectEvent.fire();
        
        var cfgSelected = DEF_CFG.SELECTED.key,
            selected = this.cfg.getProperty(cfgSelected),
            count = selected.length,
            sel = selected.concat();

        if (this.parent) {
            this.parent.cfg.setProperty(cfgSelected, []);
        } else {
            this.cfg.setProperty(cfgSelected, []);
        }
        
        if (count > 0) {
            this.deselectEvent.fire(sel);
        }
    
        return this.getSelectedDates();
    },
    
    // END SELECTION METHODS
    
    // BEGIN TYPE CONVERSION METHODS
    
    /**
    * Converts a date (either a JavaScript Date object, or a date string) to the internal data structure
    * used to represent dates: [[yyyy,mm,dd],[yyyy,mm,dd]].
    * @method _toFieldArray
    * @private
    * @param {String/Date/Date[]} date The date string of dates to deselect in the current calendar. Valid formats are
    *        individual date(s) (12/24/2005,12/26/2005) or date range(s) (12/24/2005-1/1/2006).
    *        Multiple comma-delimited dates can also be passed to this method (12/24/2005,12/11/2005-12/13/2005).
    *        This method can also take a JavaScript Date object or an array of Date objects. 
    * @return {Array[](Number[])} Array of date field arrays
    */
    _toFieldArray : function(date) {
        var returnDate = [];
    
        if (date instanceof Date) {
            returnDate = [[date.getFullYear(), date.getMonth()+1, date.getDate()]];
        } else if (Lang.isString(date)) {
            returnDate = this._parseDates(date);
        } else if (Lang.isArray(date)) {
            for (var i=0;i<date.length;++i) {
                var d = date[i];
                returnDate[returnDate.length] = [d.getFullYear(),d.getMonth()+1,d.getDate()];
            }
        }
        
        return returnDate;
    },
    
    /**
    * Converts a date field array [yyyy,mm,dd] to a JavaScript Date object. The date field array
    * is the format in which dates are as provided as arguments to selectEvent and deselectEvent listeners.
    * 
    * @method toDate
    * @param {Number[]} dateFieldArray The date field array to convert to a JavaScript Date.
    * @return {Date} JavaScript Date object representing the date field array.
    */
    toDate : function(dateFieldArray) {
        return this._toDate(dateFieldArray);
    },
    
    /**
    * Converts a date field array [yyyy,mm,dd] to a JavaScript Date object.
    * @method _toDate
    * @private
    * @deprecated Made public, toDate 
    * @param {Number[]}  dateFieldArray The date field array to convert to a JavaScript Date.
    * @return {Date} JavaScript Date object representing the date field array
    */
    _toDate : function(dateFieldArray) {
        if (dateFieldArray instanceof Date) {
            return dateFieldArray;
        } else {
            return DateMath.getDate(dateFieldArray[0],dateFieldArray[1]-1,dateFieldArray[2]);
        }
    },
    
    // END TYPE CONVERSION METHODS 
    
    // BEGIN UTILITY METHODS
    
    /**
    * Determines if 2 field arrays are equal.
    * @method _fieldArraysAreEqual
    * @private
    * @param {Number[]} array1 The first date field array to compare
    * @param {Number[]} array2 The first date field array to compare
    * @return {Boolean} The boolean that represents the equality of the two arrays
    */
    _fieldArraysAreEqual : function(array1, array2) {
        var match = false;
    
        if (array1[0]==array2[0]&&array1[1]==array2[1]&&array1[2]==array2[2]) {
            match=true; 
        }
    
        return match;
    },
    
    /**
    * Gets the index of a date field array [yyyy,mm,dd] in the current list of selected dates.
    * @method _indexOfSelectedFieldArray
    * @private
    * @param {Number[]}  find The date field array to search for
    * @return {Number}   The index of the date field array within the collection of selected dates.
    *        -1 will be returned if the date is not found.
    */
    _indexOfSelectedFieldArray : function(find) {
        var selected = -1,
            seldates = this.cfg.getProperty(DEF_CFG.SELECTED.key);
    
        for (var s=0;s<seldates.length;++s) {
            var sArray = seldates[s];
            if (find[0]==sArray[0]&&find[1]==sArray[1]&&find[2]==sArray[2]) {
                selected = s;
                break;
            }
        }
    
        return selected;
    },
    
    /**
    * Determines whether a given date is OOM (out of month).
    * @method isDateOOM
    * @param {Date} date The JavaScript Date object for which to check the OOM status
    * @return {Boolean} true if the date is OOM
    */
    isDateOOM : function(date) {
        return (date.getMonth() != this.cfg.getProperty(DEF_CFG.PAGEDATE.key).getMonth());
    },
    
    /**
    * Determines whether a given date is OOB (out of bounds - less than the mindate or more than the maxdate).
    *
    * @method isDateOOB
    * @param {Date} date The JavaScript Date object for which to check the OOB status
    * @return {Boolean} true if the date is OOB
    */
    isDateOOB : function(date) {
        var minDate = this.cfg.getProperty(DEF_CFG.MINDATE.key),
            maxDate = this.cfg.getProperty(DEF_CFG.MAXDATE.key),
            dm = DateMath;
        
        if (minDate) {
            minDate = dm.clearTime(minDate);
        } 
        if (maxDate) {
            maxDate = dm.clearTime(maxDate);
        }
    
        var clearedDate = new Date(date.getTime());
        clearedDate = dm.clearTime(clearedDate);
    
        return ((minDate && clearedDate.getTime() < minDate.getTime()) || (maxDate && clearedDate.getTime() > maxDate.getTime()));
    },
    
    /**
     * Parses a pagedate configuration property value. The value can either be specified as a string of form "mm/yyyy" or a Date object 
     * and is parsed into a Date object normalized to the first day of the month. If no value is passed in, the month and year from today's date are used to create the Date object 
     * @method _parsePageDate
     * @private
     * @param {Date|String} date Pagedate value which needs to be parsed
     * @return {Date} The Date object representing the pagedate
     */
    _parsePageDate : function(date) {
        var parsedDate;

        if (date) {
            if (date instanceof Date) {
                parsedDate = DateMath.findMonthStart(date);
            } else {
                var month, year, aMonthYear;
                aMonthYear = date.split(this.cfg.getProperty(DEF_CFG.DATE_FIELD_DELIMITER.key));
                month = parseInt(aMonthYear[this.cfg.getProperty(DEF_CFG.MY_MONTH_POSITION.key)-1], 10)-1;
                year = parseInt(aMonthYear[this.cfg.getProperty(DEF_CFG.MY_YEAR_POSITION.key)-1], 10) - this.Locale.YEAR_OFFSET;

                parsedDate = DateMath.getDate(year, month, 1);
            }
        } else {
            parsedDate = DateMath.getDate(this.today.getFullYear(), this.today.getMonth(), 1);
        }
        return parsedDate;
    },
    
    // END UTILITY METHODS
    
    // BEGIN EVENT HANDLERS
    
    /**
    * Event executed before a date is selected in the calendar widget.
    * @deprecated Event handlers for this event should be susbcribed to beforeSelectEvent.
    */
    onBeforeSelect : function() {
        if (this.cfg.getProperty(DEF_CFG.MULTI_SELECT.key) === false) {
            if (this.parent) {
                this.parent.callChildFunction("clearAllBodyCellStyles", this.Style.CSS_CELL_SELECTED);
                this.parent.deselectAll();
            } else {
                this.clearAllBodyCellStyles(this.Style.CSS_CELL_SELECTED);
                this.deselectAll();
            }
        }
    },
    
    /**
    * Event executed when a date is selected in the calendar widget.
    * @param {Array} selected An array of date field arrays representing which date or dates were selected. Example: [ [2006,8,6],[2006,8,7],[2006,8,8] ]
    * @deprecated Event handlers for this event should be susbcribed to selectEvent.
    */
    onSelect : function(selected) { },
    
    /**
    * Event executed before a date is deselected in the calendar widget.
    * @deprecated Event handlers for this event should be susbcribed to beforeDeselectEvent.
    */
    onBeforeDeselect : function() { },
    
    /**
    * Event executed when a date is deselected in the calendar widget.
    * @param {Array} selected An array of date field arrays representing which date or dates were deselected. Example: [ [2006,8,6],[2006,8,7],[2006,8,8] ]
    * @deprecated Event handlers for this event should be susbcribed to deselectEvent.
    */
    onDeselect : function(deselected) { },
    
    /**
    * Event executed when the user navigates to a different calendar page.
    * @deprecated Event handlers for this event should be susbcribed to changePageEvent.
    */
    onChangePage : function() {
        this.render();
    },

    /**
    * Event executed when the calendar widget is rendered.
    * @deprecated Event handlers for this event should be susbcribed to renderEvent.
    */
    onRender : function() { },

    /**
    * Event executed when the calendar widget is reset to its original state.
    * @deprecated Event handlers for this event should be susbcribed to resetEvemt.
    */
    onReset : function() { this.render(); },

    /**
    * Event executed when the calendar widget is completely cleared to the current month with no selections.
    * @deprecated Event handlers for this event should be susbcribed to clearEvent.
    */
    onClear : function() { this.render(); },
    
    /**
    * Validates the calendar widget. This method has no default implementation
    * and must be extended by subclassing the widget.
    * @return Should return true if the widget validates, and false if
    * it doesn't.
    * @type Boolean
    */
    validate : function() { return true; },
    
    // END EVENT HANDLERS
    
    // BEGIN DATE PARSE METHODS
    
    /**
    * Converts a date string to a date field array
    * @private
    * @param {String} sDate   Date string. Valid formats are mm/dd and mm/dd/yyyy.
    * @return    A date field array representing the string passed to the method
    * @type Array[](Number[])
    */
    _parseDate : function(sDate) {
        var aDate = sDate.split(this.Locale.DATE_FIELD_DELIMITER),
            rArray;

        if (aDate.length == 2) {
            rArray = [aDate[this.Locale.MD_MONTH_POSITION-1],aDate[this.Locale.MD_DAY_POSITION-1]];
            rArray.type = Calendar.MONTH_DAY;
        } else {
            rArray = [aDate[this.Locale.MDY_YEAR_POSITION-1] - this.Locale.YEAR_OFFSET, aDate[this.Locale.MDY_MONTH_POSITION-1],aDate[this.Locale.MDY_DAY_POSITION-1]];
            rArray.type = Calendar.DATE;
        }

        for (var i=0;i<rArray.length;i++) {
            rArray[i] = parseInt(rArray[i], 10);
        }
    
        return rArray;
    },
    
    /**
    * Converts a multi or single-date string to an array of date field arrays
    * @private
    * @param {String} sDates  Date string with one or more comma-delimited dates. Valid formats are mm/dd, mm/dd/yyyy, mm/dd/yyyy-mm/dd/yyyy
    * @return       An array of date field arrays
    * @type Array[](Number[])
    */
    _parseDates : function(sDates) {
        var aReturn = [],
            aDates = sDates.split(this.Locale.DATE_DELIMITER);
        
        for (var d=0;d<aDates.length;++d) {
            var sDate = aDates[d];
    
            if (sDate.indexOf(this.Locale.DATE_RANGE_DELIMITER) != -1) {
                // This is a range
                var aRange = sDate.split(this.Locale.DATE_RANGE_DELIMITER),
                    dateStart = this._parseDate(aRange[0]),
                    dateEnd = this._parseDate(aRange[1]),
                    fullRange = this._parseRange(dateStart, dateEnd);

                aReturn = aReturn.concat(fullRange);
            } else {
                // This is not a range
                var aDate = this._parseDate(sDate);
                aReturn.push(aDate);
            }
        }
        return aReturn;
    },
    
    /**
    * Converts a date range to the full list of included dates
    * @private
    * @param {Number[]} startDate Date field array representing the first date in the range
    * @param {Number[]} endDate  Date field array representing the last date in the range
    * @return       An array of date field arrays
    * @type Array[](Number[])
    */
    _parseRange : function(startDate, endDate) {
        var dCurrent = DateMath.add(DateMath.getDate(startDate[0],startDate[1]-1,startDate[2]),DateMath.DAY,1),
            dEnd     = DateMath.getDate(endDate[0],  endDate[1]-1,  endDate[2]),
            results = [];

        results.push(startDate);
        while (dCurrent.getTime() <= dEnd.getTime()) {
            results.push([dCurrent.getFullYear(),dCurrent.getMonth()+1,dCurrent.getDate()]);
            dCurrent = DateMath.add(dCurrent,DateMath.DAY,1);
        }
        return results;
    },
    
    // END DATE PARSE METHODS
    
    // BEGIN RENDERER METHODS
    
    /**
    * Resets the render stack of the current calendar to its original pre-render value.
    */
    resetRenderers : function() {
        this.renderStack = this._renderStack.concat();
    },
    
    /**
     * Removes all custom renderers added to the Calendar through the addRenderer, addMonthRenderer and 
     * addWeekdayRenderer methods. Calendar's render method needs to be called after removing renderers 
     * to re-render the Calendar without custom renderers applied.
     */
    removeRenderers : function() {
        this._renderStack = [];
        this.renderStack = [];
    },

    /**
    * Clears the inner HTML, CSS class and style information from the specified cell.
    * @method clearElement
    * @param {HTMLTableCellElement} cell The cell to clear
    */ 
    clearElement : function(cell) {
        cell.innerHTML = "&#160;";
        cell.className="";
    },
    
    /**
    * Adds a renderer to the render stack. The function reference passed to this method will be executed
    * when a date cell matches the conditions specified in the date string for this renderer.
    * @method addRenderer
    * @param {String} sDates  A date string to associate with the specified renderer. Valid formats
    *         include date (12/24/2005), month/day (12/24), and range (12/1/2004-1/1/2005)
    * @param {Function} fnRender The function executed to render cells that match the render rules for this renderer.
    */
    addRenderer : function(sDates, fnRender) {
        var aDates = this._parseDates(sDates);
        for (var i=0;i<aDates.length;++i) {
            var aDate = aDates[i];
        
            if (aDate.length == 2) { // this is either a range or a month/day combo
                if (aDate[0] instanceof Array) { // this is a range
                    this._addRenderer(Calendar.RANGE,aDate,fnRender);
                } else { // this is a month/day combo
                    this._addRenderer(Calendar.MONTH_DAY,aDate,fnRender);
                }
            } else if (aDate.length == 3) {
                this._addRenderer(Calendar.DATE,aDate,fnRender);
            }
        }
    },
    
    /**
    * The private method used for adding cell renderers to the local render stack.
    * This method is called by other methods that set the renderer type prior to the method call.
    * @method _addRenderer
    * @private
    * @param {String} type  The type string that indicates the type of date renderer being added.
    *         Values are YAHOO.widget.Calendar.DATE, YAHOO.widget.Calendar.MONTH_DAY, YAHOO.widget.Calendar.WEEKDAY,
    *         YAHOO.widget.Calendar.RANGE, YAHOO.widget.Calendar.MONTH
    * @param {Array}  aDates  An array of dates used to construct the renderer. The format varies based
    *         on the renderer type
    * @param {Function} fnRender The function executed to render cells that match the render rules for this renderer.
    */
    _addRenderer : function(type, aDates, fnRender) {
        var add = [type,aDates,fnRender];
        this.renderStack.unshift(add); 
        this._renderStack = this.renderStack.concat();
    },

    /**
    * Adds a month to the render stack. The function reference passed to this method will be executed
    * when a date cell matches the month passed to this method.
    * @method addMonthRenderer
    * @param {Number} month  The month (1-12) to associate with this renderer
    * @param {Function} fnRender The function executed to render cells that match the render rules for this renderer.
    */
    addMonthRenderer : function(month, fnRender) {
        this._addRenderer(Calendar.MONTH,[month],fnRender);
    },

    /**
    * Adds a weekday to the render stack. The function reference passed to this method will be executed
    * when a date cell matches the weekday passed to this method.
    * @method addWeekdayRenderer
    * @param {Number} weekday  The weekday (Sunday = 1, Monday = 2 ... Saturday = 7) to associate with this renderer
    * @param {Function} fnRender The function executed to render cells that match the render rules for this renderer.
    */
    addWeekdayRenderer : function(weekday, fnRender) {
        this._addRenderer(Calendar.WEEKDAY,[weekday],fnRender);
    },

    // END RENDERER METHODS
    
    // BEGIN CSS METHODS
    
    /**
    * Removes all styles from all body cells in the current calendar table.
    * @method clearAllBodyCellStyles
    * @param {style} style The CSS class name to remove from all calendar body cells
    */
    clearAllBodyCellStyles : function(style) {
        for (var c=0;c<this.cells.length;++c) {
            Dom.removeClass(this.cells[c],style);
        }
    },
    
    // END CSS METHODS
    
    // BEGIN GETTER/SETTER METHODS
    /**
    * Sets the calendar's month explicitly
    * @method setMonth
    * @param {Number} month  The numeric month, from 0 (January) to 11 (December)
    */
    setMonth : function(month) {
        var cfgPageDate = DEF_CFG.PAGEDATE.key,
            current = this.cfg.getProperty(cfgPageDate);
        current.setMonth(parseInt(month, 10));
        this.cfg.setProperty(cfgPageDate, current);
    },

    /**
    * Sets the calendar's year explicitly.
    * @method setYear
    * @param {Number} year  The numeric 4-digit year
    */
    setYear : function(year) {
        var cfgPageDate = DEF_CFG.PAGEDATE.key,
            current = this.cfg.getProperty(cfgPageDate);

        current.setFullYear(parseInt(year, 10) - this.Locale.YEAR_OFFSET);
        this.cfg.setProperty(cfgPageDate, current);
    },

    /**
    * Gets the list of currently selected dates from the calendar.
    * @method getSelectedDates
    * @return {Date[]} An array of currently selected JavaScript Date objects.
    */
    getSelectedDates : function() {
        var returnDates = [],
            selected = this.cfg.getProperty(DEF_CFG.SELECTED.key);

        for (var d=0;d<selected.length;++d) {
            var dateArray = selected[d];

            var date = DateMath.getDate(dateArray[0],dateArray[1]-1,dateArray[2]);
            returnDates.push(date);
        }

        returnDates.sort( function(a,b) { return a-b; } );
        return returnDates;
    },

    /// END GETTER/SETTER METHODS ///
    
    /**
    * Hides the Calendar's outer container from view.
    * @method hide
    */
    hide : function() {
        if (this.beforeHideEvent.fire()) {
            this.oDomContainer.style.display = "none";
            this.hideEvent.fire();
        }
    },

    /**
    * Shows the Calendar's outer container.
    * @method show
    */
    show : function() {
        if (this.beforeShowEvent.fire()) {
            this.oDomContainer.style.display = "block";
            this.showEvent.fire();
        }
    },

    /**
    * Returns a string representing the current browser.
    * @deprecated As of 2.3.0, environment information is available in YAHOO.env.ua
    * @see YAHOO.env.ua
    * @property browser
    * @type String
    */
    browser : (function() {
                var ua = navigator.userAgent.toLowerCase();
                      if (ua.indexOf('opera')!=-1) { // Opera (check first in case of spoof)
                         return 'opera';
                      } else if (ua.indexOf('msie 7')!=-1) { // IE7
                         return 'ie7';
                      } else if (ua.indexOf('msie') !=-1) { // IE
                         return 'ie';
                      } else if (ua.indexOf('safari')!=-1) { // Safari (check before Gecko because it includes "like Gecko")
                         return 'safari';
                      } else if (ua.indexOf('gecko') != -1) { // Gecko
                         return 'gecko';
                      } else {
                         return false;
                      }
                })(),
    /**
    * Returns a string representation of the object.
    * @method toString
    * @return {String} A string representation of the Calendar object.
    */
    toString : function() {
        return "Calendar " + this.id;
    },

    /**
     * Destroys the Calendar instance. The method will remove references
     * to HTML elements, remove any event listeners added by the Calendar,
     * and destroy the Config and CalendarNavigator instances it has created.
     *
     * @method destroy
     */
    destroy : function() {

        if (this.beforeDestroyEvent.fire()) {
            var cal = this;

            // Child objects
            if (cal.navigator) {
                cal.navigator.destroy();
            }

            if (cal.cfg) {
                cal.cfg.destroy();
            }

            // DOM event listeners
            Event.purgeElement(cal.oDomContainer, true);

            // Generated markup/DOM - Not removing the container DIV since we didn't create it.
            Dom.removeClass(cal.oDomContainer, cal.Style.CSS_WITH_TITLE);
            Dom.removeClass(cal.oDomContainer, cal.Style.CSS_CONTAINER);
            Dom.removeClass(cal.oDomContainer, cal.Style.CSS_SINGLE);
            cal.oDomContainer.innerHTML = "";

            // JS-to-DOM references
            cal.oDomContainer = null;
            cal.cells = null;

            this.destroyEvent.fire();
        }
    }
};

YAHOO.widget.Calendar = Calendar;

/**
* @namespace YAHOO.widget
* @class Calendar_Core
* @extends YAHOO.widget.Calendar
* @deprecated The old Calendar_Core class is no longer necessary.
*/
YAHOO.widget.Calendar_Core = YAHOO.widget.Calendar;

YAHOO.widget.Cal_Core = YAHOO.widget.Calendar;

})();
(function() {

    var Dom = YAHOO.util.Dom,
        DateMath = YAHOO.widget.DateMath,
        Event = YAHOO.util.Event,
        Lang = YAHOO.lang,
        Calendar = YAHOO.widget.Calendar;

/**
* YAHOO.widget.CalendarGroup is a special container class for YAHOO.widget.Calendar. This class facilitates
* the ability to have multi-page calendar views that share a single dataset and are
* dependent on each other.
*
* The calendar group instance will refer to each of its elements using a 0-based index.
* For example, to construct the placeholder for a calendar group widget with id "cal1" and
* containerId of "cal1Container", the markup would be as follows:
*   <xmp>
*       <div id="cal1Container_0"></div>
*       <div id="cal1Container_1"></div>
*   </xmp>
* The tables for the calendars ("cal1_0" and "cal1_1") will be inserted into those containers.
*
* <p>
* <strong>NOTE: As of 2.4.0, the constructor's ID argument is optional.</strong>
* The CalendarGroup can be constructed by simply providing a container ID string, 
* or a reference to a container DIV HTMLElement (the element needs to exist 
* in the document).
* 
* E.g.:
*   <xmp>
*       var c = new YAHOO.widget.CalendarGroup("calContainer", configOptions);
*   </xmp>
* or:
*   <xmp>
*       var containerDiv = YAHOO.util.Dom.get("calContainer");
*       var c = new YAHOO.widget.CalendarGroup(containerDiv, configOptions);
*   </xmp>
* </p>
* <p>
* If not provided, the ID will be generated from the container DIV ID by adding an "_t" suffix.
* For example if an ID is not provided, and the container's ID is "calContainer", the CalendarGroup's ID will be set to "calContainer_t".
* </p>
* 
* @namespace YAHOO.widget
* @class CalendarGroup
* @constructor
* @param {String} id optional The id of the table element that will represent the CalendarGroup widget. As of 2.4.0, this argument is optional.
* @param {String | HTMLElement} container The id of the container div element that will wrap the CalendarGroup table, or a reference to a DIV element which exists in the document.
* @param {Object} config optional The configuration object containing the initial configuration values for the CalendarGroup.
*/
function CalendarGroup(id, containerId, config) {
    if (arguments.length > 0) {
        this.init.apply(this, arguments);
    }
}

/**
* The set of default Config property keys and values for the CalendarGroup.
* 
* <p>
* NOTE: This property is made public in order to allow users to change 
* the default values of configuration properties. Users should not 
* modify the key string, unless they are overriding the Calendar implementation
* </p>
*
* @property YAHOO.widget.CalendarGroup.DEFAULT_CONFIG
* @static
* @type Object An object with key/value pairs, the key being the 
* uppercase configuration property name and the value being an objec 
* literal with a key string property, and a value property, specifying the 
* default value of the property 
*/

/**
* The set of default Config property keys and values for the CalendarGroup
* @property YAHOO.widget.CalendarGroup._DEFAULT_CONFIG
* @deprecated Made public. See the public DEFAULT_CONFIG property for details
* @private
* @static
* @type Object
*/
CalendarGroup.DEFAULT_CONFIG = CalendarGroup._DEFAULT_CONFIG = Calendar.DEFAULT_CONFIG;
CalendarGroup.DEFAULT_CONFIG.PAGES = {key:"pages", value:2};

var DEF_CFG = CalendarGroup.DEFAULT_CONFIG;

CalendarGroup.prototype = {

    /**
    * Initializes the calendar group. All subclasses must call this method in order for the
    * group to be initialized properly.
    * @method init
    * @param {String} id optional The id of the table element that will represent the CalendarGroup widget. As of 2.4.0, this argument is optional.
    * @param {String | HTMLElement} container The id of the container div element that will wrap the CalendarGroup table, or a reference to a DIV element which exists in the document.
    * @param {Object} config optional The configuration object containing the initial configuration values for the CalendarGroup.
    */
    init : function(id, container, config) {

        // Normalize 2.4.0, pre 2.4.0 args
        var nArgs = this._parseArgs(arguments);

        id = nArgs.id;
        container = nArgs.container;
        config = nArgs.config;

        this.oDomContainer = Dom.get(container);
        if (!this.oDomContainer) { this.logger.log("Container not found in document.", "error"); }

        if (!this.oDomContainer.id) {
            this.oDomContainer.id = Dom.generateId();
        }
        if (!id) {
            id = this.oDomContainer.id + "_t";
        }

        /**
        * The unique id associated with the CalendarGroup
        * @property id
        * @type String
        */
        this.id = id;

        /**
        * The unique id associated with the CalendarGroup container
        * @property containerId
        * @type String
        */
        this.containerId = this.oDomContainer.id;

        this.logger = new YAHOO.widget.LogWriter("CalendarGroup " + this.id);
        this.initEvents();
        this.initStyles();

        /**
        * The collection of Calendar pages contained within the CalendarGroup
        * @property pages
        * @type YAHOO.widget.Calendar[]
        */
        this.pages = [];

        Dom.addClass(this.oDomContainer, CalendarGroup.CSS_CONTAINER);
        Dom.addClass(this.oDomContainer, CalendarGroup.CSS_MULTI_UP);

        /**
        * The Config object used to hold the configuration variables for the CalendarGroup
        * @property cfg
        * @type YAHOO.util.Config
        */
        this.cfg = new YAHOO.util.Config(this);

        /**
        * The local object which contains the CalendarGroup's options
        * @property Options
        * @type Object
        */
        this.Options = {};

        /**
        * The local object which contains the CalendarGroup's locale settings
        * @property Locale
        * @type Object
        */
        this.Locale = {};

        this.setupConfig();

        if (config) {
            this.cfg.applyConfig(config, true);
        }

        this.cfg.fireQueue();

        // OPERA HACK FOR MISWRAPPED FLOATS
        if (YAHOO.env.ua.opera){
            this.renderEvent.subscribe(this._fixWidth, this, true);
            this.showEvent.subscribe(this._fixWidth, this, true);
        }

        this.logger.log("Initialized " + this.pages.length + "-page CalendarGroup", "info");
    },

    setupConfig : function() {

        var cfg = this.cfg;

        /**
        * The number of pages to include in the CalendarGroup. This value can only be set once, in the CalendarGroup's constructor arguments.
        * @config pages
        * @type Number
        * @default 2
        */
        cfg.addProperty(DEF_CFG.PAGES.key, { value:DEF_CFG.PAGES.value, validator:cfg.checkNumber, handler:this.configPages } );

        /**
        * The positive or negative year offset from the Gregorian calendar year (assuming a January 1st rollover) to 
        * be used when displaying or parsing dates.  NOTE: All JS Date objects returned by methods, or expected as input by
        * methods will always represent the Gregorian year, in order to maintain date/month/week values.
        *
        * @config year_offset
        * @type Number
        * @default 0
        */
        cfg.addProperty(DEF_CFG.YEAR_OFFSET.key, { value:DEF_CFG.YEAR_OFFSET.value, handler: this.delegateConfig, supercedes:DEF_CFG.YEAR_OFFSET.supercedes, suppressEvent:true } );

        /**
        * The date to use to represent "Today".
        *
        * @config today
        * @type Date
        * @default Today's date
        */
        cfg.addProperty(DEF_CFG.TODAY.key, { value: new Date(DEF_CFG.TODAY.value.getTime()), supercedes:DEF_CFG.TODAY.supercedes, handler: this.configToday, suppressEvent:false } );

        /**
        * The month/year representing the current visible Calendar date (mm/yyyy)
        * @config pagedate
        * @type String | Date
        * @default Today's date
        */
        cfg.addProperty(DEF_CFG.PAGEDATE.key, { value: DEF_CFG.PAGEDATE.value || new Date(DEF_CFG.TODAY.value.getTime()), handler:this.configPageDate } );

        /**
        * The date or range of dates representing the current Calendar selection
        *
        * @config selected
        * @type String
        * @default []
        */
        cfg.addProperty(DEF_CFG.SELECTED.key, { value:[], handler:this.configSelected } );

        /**
        * The title to display above the CalendarGroup's month header
        * @config title
        * @type String
        * @default ""
        */
        cfg.addProperty(DEF_CFG.TITLE.key, { value:DEF_CFG.TITLE.value, handler:this.configTitle } );

        /**
        * Whether or not a close button should be displayed for this CalendarGroup
        * @config close
        * @type Boolean
        * @default false
        */
        cfg.addProperty(DEF_CFG.CLOSE.key, { value:DEF_CFG.CLOSE.value, handler:this.configClose } );

        /**
        * Whether or not an iframe shim should be placed under the Calendar to prevent select boxes from bleeding through in Internet Explorer 6 and below.
        * This property is enabled by default for IE6 and below. It is disabled by default for other browsers for performance reasons, but can be 
        * enabled if required.
        * 
        * @config iframe
        * @type Boolean
        * @default true for IE6 and below, false for all other browsers
        */
        cfg.addProperty(DEF_CFG.IFRAME.key, { value:DEF_CFG.IFRAME.value, handler:this.configIframe, validator:cfg.checkBoolean } );

        /**
        * The minimum selectable date in the current Calendar (mm/dd/yyyy)
        * @config mindate
        * @type String | Date
        * @default null
        */
        cfg.addProperty(DEF_CFG.MINDATE.key, { value:DEF_CFG.MINDATE.value, handler:this.delegateConfig } );

        /**
        * The maximum selectable date in the current Calendar (mm/dd/yyyy)
        * @config maxdate
        * @type String | Date
        * @default null
        */
        cfg.addProperty(DEF_CFG.MAXDATE.key, { value:DEF_CFG.MAXDATE.value, handler:this.delegateConfig  } );

        // Options properties

        /**
        * True if the Calendar should allow multiple selections. False by default.
        * @config MULTI_SELECT
        * @type Boolean
        * @default false
        */
        cfg.addProperty(DEF_CFG.MULTI_SELECT.key, { value:DEF_CFG.MULTI_SELECT.value, handler:this.delegateConfig, validator:cfg.checkBoolean } );

        /**
        * The weekday the week begins on. Default is 0 (Sunday).
        * @config START_WEEKDAY
        * @type number
        * @default 0
        */ 
        cfg.addProperty(DEF_CFG.START_WEEKDAY.key, { value:DEF_CFG.START_WEEKDAY.value, handler:this.delegateConfig, validator:cfg.checkNumber  } );
        
        /**
        * True if the Calendar should show weekday labels. True by default.
        * @config SHOW_WEEKDAYS
        * @type Boolean
        * @default true
        */ 
        cfg.addProperty(DEF_CFG.SHOW_WEEKDAYS.key, { value:DEF_CFG.SHOW_WEEKDAYS.value, handler:this.delegateConfig, validator:cfg.checkBoolean } );
        
        /**
        * True if the Calendar should show week row headers. False by default.
        * @config SHOW_WEEK_HEADER
        * @type Boolean
        * @default false
        */ 
        cfg.addProperty(DEF_CFG.SHOW_WEEK_HEADER.key,{ value:DEF_CFG.SHOW_WEEK_HEADER.value, handler:this.delegateConfig, validator:cfg.checkBoolean } );
        
        /**
        * True if the Calendar should show week row footers. False by default.
        * @config SHOW_WEEK_FOOTER
        * @type Boolean
        * @default false
        */
        cfg.addProperty(DEF_CFG.SHOW_WEEK_FOOTER.key,{ value:DEF_CFG.SHOW_WEEK_FOOTER.value, handler:this.delegateConfig, validator:cfg.checkBoolean } );
        
        /**
        * True if the Calendar should suppress weeks that are not a part of the current month. False by default.
        * @config HIDE_BLANK_WEEKS
        * @type Boolean
        * @default false
        */  
        cfg.addProperty(DEF_CFG.HIDE_BLANK_WEEKS.key,{ value:DEF_CFG.HIDE_BLANK_WEEKS.value, handler:this.delegateConfig, validator:cfg.checkBoolean } );
        
        /**
        * The image that should be used for the left navigation arrow.
        * @config NAV_ARROW_LEFT
        * @type String
        * @deprecated You can customize the image by overriding the default CSS class for the left arrow - "calnavleft"
        * @default null
        */  
        cfg.addProperty(DEF_CFG.NAV_ARROW_LEFT.key, { value:DEF_CFG.NAV_ARROW_LEFT.value, handler:this.delegateConfig } );
        
        /**
        * The image that should be used for the right navigation arrow.
        * @config NAV_ARROW_RIGHT
        * @type String
        * @deprecated You can customize the image by overriding the default CSS class for the right arrow - "calnavright"
        * @default null
        */  
        cfg.addProperty(DEF_CFG.NAV_ARROW_RIGHT.key, { value:DEF_CFG.NAV_ARROW_RIGHT.value, handler:this.delegateConfig } );
    
        // Locale properties
        
        /**
        * The short month labels for the current locale.
        * @config MONTHS_SHORT
        * @type String[]
        * @default ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"]
        */
        cfg.addProperty(DEF_CFG.MONTHS_SHORT.key, { value:DEF_CFG.MONTHS_SHORT.value, handler:this.delegateConfig } );
        
        /**
        * The long month labels for the current locale.
        * @config MONTHS_LONG
        * @type String[]
        * @default ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"
        */  
        cfg.addProperty(DEF_CFG.MONTHS_LONG.key,  { value:DEF_CFG.MONTHS_LONG.value, handler:this.delegateConfig } );
        
        /**
        * The 1-character weekday labels for the current locale.
        * @config WEEKDAYS_1CHAR
        * @type String[]
        * @default ["S", "M", "T", "W", "T", "F", "S"]
        */  
        cfg.addProperty(DEF_CFG.WEEKDAYS_1CHAR.key, { value:DEF_CFG.WEEKDAYS_1CHAR.value, handler:this.delegateConfig } );
        
        /**
        * The short weekday labels for the current locale.
        * @config WEEKDAYS_SHORT
        * @type String[]
        * @default ["Su", "Mo", "Tu", "We", "Th", "Fr", "Sa"]
        */  
        cfg.addProperty(DEF_CFG.WEEKDAYS_SHORT.key, { value:DEF_CFG.WEEKDAYS_SHORT.value, handler:this.delegateConfig } );
        
        /**
        * The medium weekday labels for the current locale.
        * @config WEEKDAYS_MEDIUM
        * @type String[]
        * @default ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"]
        */  
        cfg.addProperty(DEF_CFG.WEEKDAYS_MEDIUM.key, { value:DEF_CFG.WEEKDAYS_MEDIUM.value, handler:this.delegateConfig } );
        
        /**
        * The long weekday labels for the current locale.
        * @config WEEKDAYS_LONG
        * @type String[]
        * @default ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"]
        */  
        cfg.addProperty(DEF_CFG.WEEKDAYS_LONG.key, { value:DEF_CFG.WEEKDAYS_LONG.value, handler:this.delegateConfig } );
    
        /**
        * The setting that determines which length of month labels should be used. Possible values are "short" and "long".
        * @config LOCALE_MONTHS
        * @type String
        * @default "long"
        */
        cfg.addProperty(DEF_CFG.LOCALE_MONTHS.key, { value:DEF_CFG.LOCALE_MONTHS.value, handler:this.delegateConfig } );
    
        /**
        * The setting that determines which length of weekday labels should be used. Possible values are "1char", "short", "medium", and "long".
        * @config LOCALE_WEEKDAYS
        * @type String
        * @default "short"
        */ 
        cfg.addProperty(DEF_CFG.LOCALE_WEEKDAYS.key, { value:DEF_CFG.LOCALE_WEEKDAYS.value, handler:this.delegateConfig } );
    
        /**
        * The value used to delimit individual dates in a date string passed to various Calendar functions.
        * @config DATE_DELIMITER
        * @type String
        * @default ","
        */
        cfg.addProperty(DEF_CFG.DATE_DELIMITER.key,  { value:DEF_CFG.DATE_DELIMITER.value, handler:this.delegateConfig } );
    
        /**
        * The value used to delimit date fields in a date string passed to various Calendar functions.
        * @config DATE_FIELD_DELIMITER
        * @type String
        * @default "/"
        */ 
        cfg.addProperty(DEF_CFG.DATE_FIELD_DELIMITER.key,{ value:DEF_CFG.DATE_FIELD_DELIMITER.value, handler:this.delegateConfig } );
    
        /**
        * The value used to delimit date ranges in a date string passed to various Calendar functions.
        * @config DATE_RANGE_DELIMITER
        * @type String
        * @default "-"
        */
        cfg.addProperty(DEF_CFG.DATE_RANGE_DELIMITER.key,{ value:DEF_CFG.DATE_RANGE_DELIMITER.value, handler:this.delegateConfig } );
    
        /**
        * The position of the month in a month/year date string
        * @config MY_MONTH_POSITION
        * @type Number
        * @default 1
        */
        cfg.addProperty(DEF_CFG.MY_MONTH_POSITION.key, { value:DEF_CFG.MY_MONTH_POSITION.value, handler:this.delegateConfig, validator:cfg.checkNumber } );
        
        /**
        * The position of the year in a month/year date string
        * @config MY_YEAR_POSITION
        * @type Number
        * @default 2
        */ 
        cfg.addProperty(DEF_CFG.MY_YEAR_POSITION.key, { value:DEF_CFG.MY_YEAR_POSITION.value, handler:this.delegateConfig, validator:cfg.checkNumber } );
        
        /**
        * The position of the month in a month/day date string
        * @config MD_MONTH_POSITION
        * @type Number
        * @default 1
        */ 
        cfg.addProperty(DEF_CFG.MD_MONTH_POSITION.key, { value:DEF_CFG.MD_MONTH_POSITION.value, handler:this.delegateConfig, validator:cfg.checkNumber } );
        
        /**
        * The position of the day in a month/year date string
        * @config MD_DAY_POSITION
        * @type Number
        * @default 2
        */ 
        cfg.addProperty(DEF_CFG.MD_DAY_POSITION.key,  { value:DEF_CFG.MD_DAY_POSITION.value, handler:this.delegateConfig, validator:cfg.checkNumber } );
        
        /**
        * The position of the month in a month/day/year date string
        * @config MDY_MONTH_POSITION
        * @type Number
        * @default 1
        */ 
        cfg.addProperty(DEF_CFG.MDY_MONTH_POSITION.key, { value:DEF_CFG.MDY_MONTH_POSITION.value, handler:this.delegateConfig, validator:cfg.checkNumber } );
        
        /**
        * The position of the day in a month/day/year date string
        * @config MDY_DAY_POSITION
        * @type Number
        * @default 2
        */ 
        cfg.addProperty(DEF_CFG.MDY_DAY_POSITION.key, { value:DEF_CFG.MDY_DAY_POSITION.value, handler:this.delegateConfig, validator:cfg.checkNumber } );
        
        /**
        * The position of the year in a month/day/year date string
        * @config MDY_YEAR_POSITION
        * @type Number
        * @default 3
        */ 
        cfg.addProperty(DEF_CFG.MDY_YEAR_POSITION.key, { value:DEF_CFG.MDY_YEAR_POSITION.value, handler:this.delegateConfig, validator:cfg.checkNumber } );
    
        /**
        * The position of the month in the month year label string used as the Calendar header
        * @config MY_LABEL_MONTH_POSITION
        * @type Number
        * @default 1
        */
        cfg.addProperty(DEF_CFG.MY_LABEL_MONTH_POSITION.key, { value:DEF_CFG.MY_LABEL_MONTH_POSITION.value, handler:this.delegateConfig, validator:cfg.checkNumber } );
    
        /**
        * The position of the year in the month year label string used as the Calendar header
        * @config MY_LABEL_YEAR_POSITION
        * @type Number
        * @default 2
        */
        cfg.addProperty(DEF_CFG.MY_LABEL_YEAR_POSITION.key, { value:DEF_CFG.MY_LABEL_YEAR_POSITION.value, handler:this.delegateConfig, validator:cfg.checkNumber } );

        /**
        * The suffix used after the month when rendering the Calendar header
        * @config MY_LABEL_MONTH_SUFFIX
        * @type String
        * @default " "
        */
        cfg.addProperty(DEF_CFG.MY_LABEL_MONTH_SUFFIX.key, { value:DEF_CFG.MY_LABEL_MONTH_SUFFIX.value, handler:this.delegateConfig } );
        
        /**
        * The suffix used after the year when rendering the Calendar header
        * @config MY_LABEL_YEAR_SUFFIX
        * @type String
        * @default ""
        */
        cfg.addProperty(DEF_CFG.MY_LABEL_YEAR_SUFFIX.key, { value:DEF_CFG.MY_LABEL_YEAR_SUFFIX.value, handler:this.delegateConfig } );

        /**
        * Configuration for the Month Year Navigation UI. By default it is disabled
        * @config NAV
        * @type Object
        * @default null
        */
        cfg.addProperty(DEF_CFG.NAV.key, { value:DEF_CFG.NAV.value, handler:this.configNavigator } );

        /**
         * The map of UI strings which the CalendarGroup UI uses.
         *
         * @config strings
         * @type {Object}
         * @default An object with the properties shown below:
         *     <dl>
         *         <dt>previousMonth</dt><dd><em>String</em> : The string to use for the "Previous Month" navigation UI. Defaults to "Previous Month".</dd>
         *         <dt>nextMonth</dt><dd><em>String</em> : The string to use for the "Next Month" navigation UI. Defaults to "Next Month".</dd>
         *         <dt>close</dt><dd><em>String</em> : The string to use for the close button label. Defaults to "Close".</dd>
         *     </dl>
         */
        cfg.addProperty(DEF_CFG.STRINGS.key, { 
            value:DEF_CFG.STRINGS.value, 
            handler:this.configStrings, 
            validator: function(val) {
                return Lang.isObject(val);
            },
            supercedes: DEF_CFG.STRINGS.supercedes
        });
    },

    /**
    * Initializes CalendarGroup's built-in CustomEvents
    * @method initEvents
    */
    initEvents : function() {

        var me = this,
            strEvent = "Event",
            CE = YAHOO.util.CustomEvent;

        /**
        * Proxy subscriber to subscribe to the CalendarGroup's child Calendars' CustomEvents
        * @method sub
        * @private
        * @param {Function} fn The function to subscribe to this CustomEvent
        * @param {Object} obj The CustomEvent's scope object
        * @param {Boolean} bOverride Whether or not to apply scope correction
        */
        var sub = function(fn, obj, bOverride) {
            for (var p=0;p<me.pages.length;++p) {
                var cal = me.pages[p];
                cal[this.type + strEvent].subscribe(fn, obj, bOverride);
            }
        };

        /**
        * Proxy unsubscriber to unsubscribe from the CalendarGroup's child Calendars' CustomEvents
        * @method unsub
        * @private
        * @param {Function} fn The function to subscribe to this CustomEvent
        * @param {Object} obj The CustomEvent's scope object
        */
        var unsub = function(fn, obj) {
            for (var p=0;p<me.pages.length;++p) {
                var cal = me.pages[p];
                cal[this.type + strEvent].unsubscribe(fn, obj);
            }
        };

        var defEvents = Calendar._EVENT_TYPES;

        /**
        * Fired before a date selection is made
        * @event beforeSelectEvent
        */
        me.beforeSelectEvent = new CE(defEvents.BEFORE_SELECT);
        me.beforeSelectEvent.subscribe = sub; me.beforeSelectEvent.unsubscribe = unsub;

        /**
        * Fired when a date selection is made
        * @event selectEvent
        * @param {Array} Array of Date field arrays in the format [YYYY, MM, DD].
        */
        me.selectEvent = new CE(defEvents.SELECT); 
        me.selectEvent.subscribe = sub; me.selectEvent.unsubscribe = unsub;

        /**
        * Fired before a date or set of dates is deselected
        * @event beforeDeselectEvent
        */
        me.beforeDeselectEvent = new CE(defEvents.BEFORE_DESELECT); 
        me.beforeDeselectEvent.subscribe = sub; me.beforeDeselectEvent.unsubscribe = unsub;

        /**
        * Fired when a date or set of dates has been deselected
        * @event deselectEvent
        * @param {Array} Array of Date field arrays in the format [YYYY, MM, DD].
        */
        me.deselectEvent = new CE(defEvents.DESELECT); 
        me.deselectEvent.subscribe = sub; me.deselectEvent.unsubscribe = unsub;
        
        /**
        * Fired when the Calendar page is changed
        * @event changePageEvent
        */
        me.changePageEvent = new CE(defEvents.CHANGE_PAGE); 
        me.changePageEvent.subscribe = sub; me.changePageEvent.unsubscribe = unsub;

        /**
        * Fired before the Calendar is rendered
        * @event beforeRenderEvent
        */
        me.beforeRenderEvent = new CE(defEvents.BEFORE_RENDER);
        me.beforeRenderEvent.subscribe = sub; me.beforeRenderEvent.unsubscribe = unsub;
    
        /**
        * Fired when the Calendar is rendered
        * @event renderEvent
        */
        me.renderEvent = new CE(defEvents.RENDER);
        me.renderEvent.subscribe = sub; me.renderEvent.unsubscribe = unsub;
    
        /**
        * Fired when the Calendar is reset
        * @event resetEvent
        */
        me.resetEvent = new CE(defEvents.RESET); 
        me.resetEvent.subscribe = sub; me.resetEvent.unsubscribe = unsub;
    
        /**
        * Fired when the Calendar is cleared
        * @event clearEvent
        */
        me.clearEvent = new CE(defEvents.CLEAR);
        me.clearEvent.subscribe = sub; me.clearEvent.unsubscribe = unsub;

        /**
        * Fired just before the CalendarGroup is to be shown
        * @event beforeShowEvent
        */
        me.beforeShowEvent = new CE(defEvents.BEFORE_SHOW);
    
        /**
        * Fired after the CalendarGroup is shown
        * @event showEvent
        */
        me.showEvent = new CE(defEvents.SHOW);
    
        /**
        * Fired just before the CalendarGroup is to be hidden
        * @event beforeHideEvent
        */
        me.beforeHideEvent = new CE(defEvents.BEFORE_HIDE);
    
        /**
        * Fired after the CalendarGroup is hidden
        * @event hideEvent
        */
        me.hideEvent = new CE(defEvents.HIDE);

        /**
        * Fired just before the CalendarNavigator is to be shown
        * @event beforeShowNavEvent
        */
        me.beforeShowNavEvent = new CE(defEvents.BEFORE_SHOW_NAV);
    
        /**
        * Fired after the CalendarNavigator is shown
        * @event showNavEvent
        */
        me.showNavEvent = new CE(defEvents.SHOW_NAV);
    
        /**
        * Fired just before the CalendarNavigator is to be hidden
        * @event beforeHideNavEvent
        */
        me.beforeHideNavEvent = new CE(defEvents.BEFORE_HIDE_NAV);

        /**
        * Fired after the CalendarNavigator is hidden
        * @event hideNavEvent
        */
        me.hideNavEvent = new CE(defEvents.HIDE_NAV);

        /**
        * Fired just before the CalendarNavigator is to be rendered
        * @event beforeRenderNavEvent
        */
        me.beforeRenderNavEvent = new CE(defEvents.BEFORE_RENDER_NAV);

        /**
        * Fired after the CalendarNavigator is rendered
        * @event renderNavEvent
        */
        me.renderNavEvent = new CE(defEvents.RENDER_NAV);

        /**
        * Fired just before the CalendarGroup is to be destroyed
        * @event beforeDestroyEvent
        */
        me.beforeDestroyEvent = new CE(defEvents.BEFORE_DESTROY);

        /**
        * Fired after the CalendarGroup is destroyed. This event should be used
        * for notification only. When this event is fired, important CalendarGroup instance
        * properties, dom references and event listeners have already been 
        * removed/dereferenced, and hence the CalendarGroup instance is not in a usable 
        * state.
        *
        * @event destroyEvent
        */
        me.destroyEvent = new CE(defEvents.DESTROY);
    },
    
    /**
    * The default Config handler for the "pages" property
    * @method configPages
    * @param {String} type The CustomEvent type (usually the property name)
    * @param {Object[]} args The CustomEvent arguments. For configuration handlers, args[0] will equal the newly applied value for the property.
    * @param {Object} obj The scope object. For configuration handlers, this will usually equal the owner.
    */
    configPages : function(type, args, obj) {
        var pageCount = args[0],
            cfgPageDate = DEF_CFG.PAGEDATE.key,
            sep = "_",
            caldate,
            firstPageDate = null,
            groupCalClass = "groupcal",
            firstClass = "first-of-type",
            lastClass = "last-of-type";

        for (var p=0;p<pageCount;++p) {
            var calId = this.id + sep + p,
                calContainerId = this.containerId + sep + p,
                childConfig = this.cfg.getConfig();

            childConfig.close = false;
            childConfig.title = false;
            childConfig.navigator = null;

            if (p > 0) {
                caldate = new Date(firstPageDate);
                this._setMonthOnDate(caldate, caldate.getMonth() + p);
                childConfig.pageDate = caldate;
            }

            var cal = this.constructChild(calId, calContainerId, childConfig);

            Dom.removeClass(cal.oDomContainer, this.Style.CSS_SINGLE);
            Dom.addClass(cal.oDomContainer, groupCalClass);

            if (p===0) {
                firstPageDate = cal.cfg.getProperty(cfgPageDate);
                Dom.addClass(cal.oDomContainer, firstClass);
            }
    
            if (p==(pageCount-1)) {
                Dom.addClass(cal.oDomContainer, lastClass);
            }
    
            cal.parent = this;
            cal.index = p; 
    
            this.pages[this.pages.length] = cal;
        }
    },
    
    /**
    * The default Config handler for the "pagedate" property
    * @method configPageDate
    * @param {String} type The CustomEvent type (usually the property name)
    * @param {Object[]} args The CustomEvent arguments. For configuration handlers, args[0] will equal the newly applied value for the property.
    * @param {Object} obj The scope object. For configuration handlers, this will usually equal the owner.
    */
    configPageDate : function(type, args, obj) {
        var val = args[0],
            firstPageDate;

        var cfgPageDate = DEF_CFG.PAGEDATE.key;
        
        for (var p=0;p<this.pages.length;++p) {
            var cal = this.pages[p];
            if (p === 0) {
                firstPageDate = cal._parsePageDate(val);
                cal.cfg.setProperty(cfgPageDate, firstPageDate);
            } else {
                var pageDate = new Date(firstPageDate);
                this._setMonthOnDate(pageDate, pageDate.getMonth() + p);
                cal.cfg.setProperty(cfgPageDate, pageDate);
            }
        }
    },
    
    /**
    * The default Config handler for the CalendarGroup "selected" property
    * @method configSelected
    * @param {String} type The CustomEvent type (usually the property name)
    * @param {Object[]} args The CustomEvent arguments. For configuration handlers, args[0] will equal the newly applied value for the property.
    * @param {Object} obj The scope object. For configuration handlers, this will usually equal the owner.
    */
    configSelected : function(type, args, obj) {
        var cfgSelected = DEF_CFG.SELECTED.key;
        this.delegateConfig(type, args, obj);
        var selected = (this.pages.length > 0) ? this.pages[0].cfg.getProperty(cfgSelected) : []; 
        this.cfg.setProperty(cfgSelected, selected, true);
    },

    
    /**
    * Delegates a configuration property to the CustomEvents associated with the CalendarGroup's children
    * @method delegateConfig
    * @param {String} type The CustomEvent type (usually the property name)
    * @param {Object[]} args The CustomEvent arguments. For configuration handlers, args[0] will equal the newly applied value for the property.
    * @param {Object} obj The scope object. For configuration handlers, this will usually equal the owner.
    */
    delegateConfig : function(type, args, obj) {
        var val = args[0];
        var cal;
    
        for (var p=0;p<this.pages.length;p++) {
            cal = this.pages[p];
            cal.cfg.setProperty(type, val);
        }
    },

    /**
    * Adds a function to all child Calendars within this CalendarGroup.
    * @method setChildFunction
    * @param {String}  fnName  The name of the function
    * @param {Function}  fn   The function to apply to each Calendar page object
    */
    setChildFunction : function(fnName, fn) {
        var pageCount = this.cfg.getProperty(DEF_CFG.PAGES.key);
    
        for (var p=0;p<pageCount;++p) {
            this.pages[p][fnName] = fn;
        }
    },

    /**
    * Calls a function within all child Calendars within this CalendarGroup.
    * @method callChildFunction
    * @param {String}  fnName  The name of the function
    * @param {Array}  args  The arguments to pass to the function
    */
    callChildFunction : function(fnName, args) {
        var pageCount = this.cfg.getProperty(DEF_CFG.PAGES.key);

        for (var p=0;p<pageCount;++p) {
            var page = this.pages[p];
            if (page[fnName]) {
                var fn = page[fnName];
                fn.call(page, args);
            }
        } 
    },

    /**
    * Constructs a child calendar. This method can be overridden if a subclassed version of the default
    * calendar is to be used.
    * @method constructChild
    * @param {String} id   The id of the table element that will represent the calendar widget
    * @param {String} containerId The id of the container div element that will wrap the calendar table
    * @param {Object} config  The configuration object containing the Calendar's arguments
    * @return {YAHOO.widget.Calendar} The YAHOO.widget.Calendar instance that is constructed
    */
    constructChild : function(id,containerId,config) {
        var container = document.getElementById(containerId);
        if (! container) {
            container = document.createElement("div");
            container.id = containerId;
            this.oDomContainer.appendChild(container);
        }
        return new Calendar(id,containerId,config);
    },
    
    /**
    * Sets the calendar group's month explicitly. This month will be set into the first
    * page of the multi-page calendar, and all other months will be iterated appropriately.
    * @method setMonth
    * @param {Number} month  The numeric month, from 0 (January) to 11 (December)
    */
    setMonth : function(month) {
        month = parseInt(month, 10);
        var currYear;

        var cfgPageDate = DEF_CFG.PAGEDATE.key;

        for (var p=0; p<this.pages.length; ++p) {
            var cal = this.pages[p];
            var pageDate = cal.cfg.getProperty(cfgPageDate);
            if (p === 0) {
                currYear = pageDate.getFullYear();
            } else {
                pageDate.setFullYear(currYear);
            }
            this._setMonthOnDate(pageDate, month+p); 
            cal.cfg.setProperty(cfgPageDate, pageDate);
        }
    },

    /**
    * Sets the calendar group's year explicitly. This year will be set into the first
    * page of the multi-page calendar, and all other months will be iterated appropriately.
    * @method setYear
    * @param {Number} year  The numeric 4-digit year
    */
    setYear : function(year) {
    
        var cfgPageDate = DEF_CFG.PAGEDATE.key;
    
        year = parseInt(year, 10);
        for (var p=0;p<this.pages.length;++p) {
            var cal = this.pages[p];
            var pageDate = cal.cfg.getProperty(cfgPageDate);
    
            if ((pageDate.getMonth()+1) == 1 && p>0) {
                year+=1;
            }
            cal.setYear(year);
        }
    },

    /**
    * Calls the render function of all child calendars within the group.
    * @method render
    */
    render : function() {
        this.renderHeader();
        for (var p=0;p<this.pages.length;++p) {
            var cal = this.pages[p];
            cal.render();
        }
        this.renderFooter();
    },

    /**
    * Selects a date or a collection of dates on the current calendar. This method, by default,
    * does not call the render method explicitly. Once selection has completed, render must be 
    * called for the changes to be reflected visually.
    * @method select
    * @param    {String/Date/Date[]}    date    The date string of dates to select in the current calendar. Valid formats are
    *                               individual date(s) (12/24/2005,12/26/2005) or date range(s) (12/24/2005-1/1/2006).
    *                               Multiple comma-delimited dates can also be passed to this method (12/24/2005,12/11/2005-12/13/2005).
    *                               This method can also take a JavaScript Date object or an array of Date objects.
    * @return {Date[]} Array of JavaScript Date objects representing all individual dates that are currently selected.
    */
    select : function(date) {
        for (var p=0;p<this.pages.length;++p) {
            var cal = this.pages[p];
            cal.select(date);
        }
        return this.getSelectedDates();
    },

    /**
    * Selects dates in the CalendarGroup based on the cell index provided. This method is used to select cells without having to do a full render. The selected style is applied to the cells directly.
    * The value of the MULTI_SELECT Configuration attribute will determine the set of dates which get selected. 
    * <ul>
    *    <li>If MULTI_SELECT is false, selectCell will select the cell at the specified index for only the last displayed Calendar page.</li>
    *    <li>If MULTI_SELECT is true, selectCell will select the cell at the specified index, on each displayed Calendar page.</li>
    * </ul>
    * @method selectCell
    * @param {Number} cellIndex The index of the cell to be selected. 
    * @return {Date[]} Array of JavaScript Date objects representing all individual dates that are currently selected.
    */
    selectCell : function(cellIndex) {
        for (var p=0;p<this.pages.length;++p) {
            var cal = this.pages[p];
            cal.selectCell(cellIndex);
        }
        return this.getSelectedDates();
    },
    
    /**
    * Deselects a date or a collection of dates on the current calendar. This method, by default,
    * does not call the render method explicitly. Once deselection has completed, render must be 
    * called for the changes to be reflected visually.
    * @method deselect
    * @param {String/Date/Date[]} date The date string of dates to deselect in the current calendar. Valid formats are
    *        individual date(s) (12/24/2005,12/26/2005) or date range(s) (12/24/2005-1/1/2006).
    *        Multiple comma-delimited dates can also be passed to this method (12/24/2005,12/11/2005-12/13/2005).
    *        This method can also take a JavaScript Date object or an array of Date objects. 
    * @return {Date[]}   Array of JavaScript Date objects representing all individual dates that are currently selected.
    */
    deselect : function(date) {
        for (var p=0;p<this.pages.length;++p) {
            var cal = this.pages[p];
            cal.deselect(date);
        }
        return this.getSelectedDates();
    },
    
    /**
    * Deselects all dates on the current calendar.
    * @method deselectAll
    * @return {Date[]}  Array of JavaScript Date objects representing all individual dates that are currently selected.
    *      Assuming that this function executes properly, the return value should be an empty array.
    *      However, the empty array is returned for the sake of being able to check the selection status
    *      of the calendar.
    */
    deselectAll : function() {
        for (var p=0;p<this.pages.length;++p) {
            var cal = this.pages[p];
            cal.deselectAll();
        }
        return this.getSelectedDates();
    },

    /**
    * Deselects dates in the CalendarGroup based on the cell index provided. This method is used to select cells without having to do a full render. The selected style is applied to the cells directly.
    * deselectCell will deselect the cell at the specified index on each displayed Calendar page.
    *
    * @method deselectCell
    * @param {Number} cellIndex The index of the cell to deselect. 
    * @return {Date[]} Array of JavaScript Date objects representing all individual dates that are currently selected.
    */
    deselectCell : function(cellIndex) {
        for (var p=0;p<this.pages.length;++p) {
            var cal = this.pages[p];
            cal.deselectCell(cellIndex);
        }
        return this.getSelectedDates();
    },

    /**
    * Resets the calendar widget to the originally selected month and year, and 
    * sets the calendar to the initial selection(s).
    * @method reset
    */
    reset : function() {
        for (var p=0;p<this.pages.length;++p) {
            var cal = this.pages[p];
            cal.reset();
        }
    },

    /**
    * Clears the selected dates in the current calendar widget and sets the calendar
    * to the current month and year.
    * @method clear
    */
    clear : function() {
        for (var p=0;p<this.pages.length;++p) {
            var cal = this.pages[p];
            cal.clear();
        }

        this.cfg.setProperty(DEF_CFG.SELECTED.key, []);
        this.cfg.setProperty(DEF_CFG.PAGEDATE.key, new Date(this.pages[0].today.getTime()));
        this.render();
    },

    /**
    * Navigates to the next month page in the calendar widget.
    * @method nextMonth
    */
    nextMonth : function() {
        for (var p=0;p<this.pages.length;++p) {
            var cal = this.pages[p];
            cal.nextMonth();
        }
    },
    
    /**
    * Navigates to the previous month page in the calendar widget.
    * @method previousMonth
    */
    previousMonth : function() {
        for (var p=this.pages.length-1;p>=0;--p) {
            var cal = this.pages[p];
            cal.previousMonth();
        }
    },
    
    /**
    * Navigates to the next year in the currently selected month in the calendar widget.
    * @method nextYear
    */
    nextYear : function() {
        for (var p=0;p<this.pages.length;++p) {
            var cal = this.pages[p];
            cal.nextYear();
        }
    },

    /**
    * Navigates to the previous year in the currently selected month in the calendar widget.
    * @method previousYear
    */
    previousYear : function() {
        for (var p=0;p<this.pages.length;++p) {
            var cal = this.pages[p];
            cal.previousYear();
        }
    },

    /**
    * Gets the list of currently selected dates from the calendar.
    * @return   An array of currently selected JavaScript Date objects.
    * @type Date[]
    */
    getSelectedDates : function() { 
        var returnDates = [];
        var selected = this.cfg.getProperty(DEF_CFG.SELECTED.key);
        for (var d=0;d<selected.length;++d) {
            var dateArray = selected[d];

            var date = DateMath.getDate(dateArray[0],dateArray[1]-1,dateArray[2]);
            returnDates.push(date);
        }

        returnDates.sort( function(a,b) { return a-b; } );
        return returnDates;
    },

    /**
    * Adds a renderer to the render stack. The function reference passed to this method will be executed
    * when a date cell matches the conditions specified in the date string for this renderer.
    * @method addRenderer
    * @param {String} sDates  A date string to associate with the specified renderer. Valid formats
    *         include date (12/24/2005), month/day (12/24), and range (12/1/2004-1/1/2005)
    * @param {Function} fnRender The function executed to render cells that match the render rules for this renderer.
    */
    addRenderer : function(sDates, fnRender) {
        for (var p=0;p<this.pages.length;++p) {
            var cal = this.pages[p];
            cal.addRenderer(sDates, fnRender);
        }
    },

    /**
    * Adds a month to the render stack. The function reference passed to this method will be executed
    * when a date cell matches the month passed to this method.
    * @method addMonthRenderer
    * @param {Number} month  The month (1-12) to associate with this renderer
    * @param {Function} fnRender The function executed to render cells that match the render rules for this renderer.
    */
    addMonthRenderer : function(month, fnRender) {
        for (var p=0;p<this.pages.length;++p) {
            var cal = this.pages[p];
            cal.addMonthRenderer(month, fnRender);
        }
    },

    /**
    * Adds a weekday to the render stack. The function reference passed to this method will be executed
    * when a date cell matches the weekday passed to this method.
    * @method addWeekdayRenderer
    * @param {Number} weekday  The weekday (1-7) to associate with this renderer. 1=Sunday, 2=Monday etc.
    * @param {Function} fnRender The function executed to render cells that match the render rules for this renderer.
    */
    addWeekdayRenderer : function(weekday, fnRender) {
        for (var p=0;p<this.pages.length;++p) {
            var cal = this.pages[p];
            cal.addWeekdayRenderer(weekday, fnRender);
        }
    },

    /**
     * Removes all custom renderers added to the CalendarGroup through the addRenderer, addMonthRenderer and 
     * addWeekRenderer methods. CalendarGroup's render method needs to be called to after removing renderers 
     * to see the changes applied.
     * 
     * @method removeRenderers
     */
    removeRenderers : function() {
        this.callChildFunction("removeRenderers");
    },

    /**
    * Renders the header for the CalendarGroup.
    * @method renderHeader
    */
    renderHeader : function() {
        // EMPTY DEFAULT IMPL
    },

    /**
    * Renders a footer for the 2-up calendar container. By default, this method is
    * unimplemented.
    * @method renderFooter
    */
    renderFooter : function() {
        // EMPTY DEFAULT IMPL
    },

    /**
    * Adds the designated number of months to the current calendar month, and sets the current
    * calendar page date to the new month.
    * @method addMonths
    * @param {Number} count The number of months to add to the current calendar
    */
    addMonths : function(count) {
        this.callChildFunction("addMonths", count);
    },
    
    /**
    * Subtracts the designated number of months from the current calendar month, and sets the current
    * calendar page date to the new month.
    * @method subtractMonths
    * @param {Number} count The number of months to subtract from the current calendar
    */
    subtractMonths : function(count) {
        this.callChildFunction("subtractMonths", count);
    },

    /**
    * Adds the designated number of years to the current calendar, and sets the current
    * calendar page date to the new month.
    * @method addYears
    * @param {Number} count The number of years to add to the current calendar
    */
    addYears : function(count) {
        this.callChildFunction("addYears", count);
    },

    /**
    * Subtcats the designated number of years from the current calendar, and sets the current
    * calendar page date to the new month.
    * @method subtractYears
    * @param {Number} count The number of years to subtract from the current calendar
    */
    subtractYears : function(count) {
        this.callChildFunction("subtractYears", count);
    },

    /**
     * Returns the Calendar page instance which has a pagedate (month/year) matching the given date. 
     * Returns null if no match is found.
     * 
     * @method getCalendarPage
     * @param {Date} date The JavaScript Date object for which a Calendar page is to be found.
     * @return {Calendar} The Calendar page instance representing the month to which the date 
     * belongs.
     */
    getCalendarPage : function(date) {
        var cal = null;
        if (date) {
            var y = date.getFullYear(),
                m = date.getMonth();

            var pages = this.pages;
            for (var i = 0; i < pages.length; ++i) {
                var pageDate = pages[i].cfg.getProperty("pagedate");
                if (pageDate.getFullYear() === y && pageDate.getMonth() === m) {
                    cal = pages[i];
                    break;
                }
            }
        }
        return cal;
    },

    /**
    * Sets the month on a Date object, taking into account year rollover if the month is less than 0 or greater than 11.
    * The Date object passed in is modified. It should be cloned before passing it into this method if the original value needs to be maintained
    * @method _setMonthOnDate
    * @private
    * @param {Date} date The Date object on which to set the month index
    * @param {Number} iMonth The month index to set
    */
    _setMonthOnDate : function(date, iMonth) {
        // Bug in Safari 1.3, 2.0 (WebKit build < 420), Date.setMonth does not work consistently if iMonth is not 0-11
        if (YAHOO.env.ua.webkit && YAHOO.env.ua.webkit < 420 && (iMonth < 0 || iMonth > 11)) {
            var newDate = DateMath.add(date, DateMath.MONTH, iMonth-date.getMonth());
            date.setTime(newDate.getTime());
        } else {
            date.setMonth(iMonth);
        }
    },
    
    /**
     * Fixes the width of the CalendarGroup container element, to account for miswrapped floats
     * @method _fixWidth
     * @private
     */
    _fixWidth : function() {
        var w = 0;
        for (var p=0;p<this.pages.length;++p) {
            var cal = this.pages[p];
            w += cal.oDomContainer.offsetWidth;
        }
        if (w > 0) {
            this.oDomContainer.style.width = w + "px";
        }
    },
    
    /**
    * Returns a string representation of the object.
    * @method toString
    * @return {String} A string representation of the CalendarGroup object.
    */
    toString : function() {
        return "CalendarGroup " + this.id;
    },

    /**
     * Destroys the CalendarGroup instance. The method will remove references
     * to HTML elements, remove any event listeners added by the CalendarGroup.
     * 
     * It will also destroy the Config and CalendarNavigator instances created by the 
     * CalendarGroup and the individual Calendar instances created for each page.
     *
     * @method destroy
     */
    destroy : function() {

        if (this.beforeDestroyEvent.fire()) {

            var cal = this;
    
            // Child objects
            if (cal.navigator) {
                cal.navigator.destroy();
            }
    
            if (cal.cfg) {
                cal.cfg.destroy();
            }
    
            // DOM event listeners
            Event.purgeElement(cal.oDomContainer, true);
    
            // Generated markup/DOM - Not removing the container DIV since we didn't create it.
            Dom.removeClass(cal.oDomContainer, CalendarGroup.CSS_CONTAINER);
            Dom.removeClass(cal.oDomContainer, CalendarGroup.CSS_MULTI_UP);
            
            for (var i = 0, l = cal.pages.length; i < l; i++) {
                cal.pages[i].destroy();
                cal.pages[i] = null;
            }
    
            cal.oDomContainer.innerHTML = "";
    
            // JS-to-DOM references
            cal.oDomContainer = null;
    
            this.destroyEvent.fire();
        }
    }
};

/**
* CSS class representing the container for the calendar
* @property YAHOO.widget.CalendarGroup.CSS_CONTAINER
* @static
* @final
* @type String
*/
CalendarGroup.CSS_CONTAINER = "yui-calcontainer";

/**
* CSS class representing the container for the calendar
* @property YAHOO.widget.CalendarGroup.CSS_MULTI_UP
* @static
* @final
* @type String
*/
CalendarGroup.CSS_MULTI_UP = "multi";

/**
* CSS class representing the title for the 2-up calendar
* @property YAHOO.widget.CalendarGroup.CSS_2UPTITLE
* @static
* @final
* @type String
*/
CalendarGroup.CSS_2UPTITLE = "title";

/**
* CSS class representing the close icon for the 2-up calendar
* @property YAHOO.widget.CalendarGroup.CSS_2UPCLOSE
* @static
* @final
* @deprecated Along with Calendar.IMG_ROOT and NAV_ARROW_LEFT, NAV_ARROW_RIGHT configuration properties.
*     Calendar's <a href="YAHOO.widget.Calendar.html#Style.CSS_CLOSE">Style.CSS_CLOSE</a> property now represents the CSS class used to render the close icon
* @type String
*/
CalendarGroup.CSS_2UPCLOSE = "close-icon";

YAHOO.lang.augmentProto(CalendarGroup, Calendar, "buildDayLabel",
                                                 "buildMonthLabel",
                                                 "renderOutOfBoundsDate",
                                                 "renderRowHeader",
                                                 "renderRowFooter",
                                                 "renderCellDefault",
                                                 "styleCellDefault",
                                                 "renderCellStyleHighlight1",
                                                 "renderCellStyleHighlight2",
                                                 "renderCellStyleHighlight3",
                                                 "renderCellStyleHighlight4",
                                                 "renderCellStyleToday",
                                                 "renderCellStyleSelected",
                                                 "renderCellNotThisMonth",
                                                 "renderBodyCellRestricted",
                                                 "initStyles",
                                                 "configTitle",
                                                 "configClose",
                                                 "configIframe",
                                                 "configStrings",
                                                 "configToday",
                                                 "configNavigator",
                                                 "createTitleBar",
                                                 "createCloseButton",
                                                 "removeTitleBar",
                                                 "removeCloseButton",
                                                 "hide",
                                                 "show",
                                                 "toDate",
                                                 "_toDate",
                                                 "_parseArgs",
                                                 "browser");

YAHOO.widget.CalGrp = CalendarGroup;
YAHOO.widget.CalendarGroup = CalendarGroup;

/**
* @class YAHOO.widget.Calendar2up
* @extends YAHOO.widget.CalendarGroup
* @deprecated The old Calendar2up class is no longer necessary, since CalendarGroup renders in a 2up view by default.
*/
YAHOO.widget.Calendar2up = function(id, containerId, config) {
    this.init(id, containerId, config);
};

YAHOO.extend(YAHOO.widget.Calendar2up, CalendarGroup);

/**
* @deprecated The old Calendar2up class is no longer necessary, since CalendarGroup renders in a 2up view by default.
*/
YAHOO.widget.Cal2up = YAHOO.widget.Calendar2up;

})();
/**
 * The CalendarNavigator is used along with a Calendar/CalendarGroup to 
 * provide a Month/Year popup navigation control, allowing the user to navigate 
 * to a specific month/year in the Calendar/CalendarGroup without having to 
 * scroll through months sequentially
 *
 * @namespace YAHOO.widget
 * @class CalendarNavigator
 * @constructor
 * @param {Calendar|CalendarGroup} cal The instance of the Calendar or CalendarGroup to which this CalendarNavigator should be attached.
 */
YAHOO.widget.CalendarNavigator = function(cal) {
    this.init(cal);
};

(function() {
    // Setup static properties (inside anon fn, so that we can use shortcuts)
    var CN = YAHOO.widget.CalendarNavigator;

    /**
     * YAHOO.widget.CalendarNavigator.CLASSES contains constants
     * for the class values applied to the CalendarNaviatgator's 
     * DOM elements
     * @property YAHOO.widget.CalendarNavigator.CLASSES
     * @type Object
     * @static
     */
    CN.CLASSES = {
        /**
         * Class applied to the Calendar Navigator's bounding box
         * @property YAHOO.widget.CalendarNavigator.CLASSES.NAV
         * @type String
         * @static
         */
        NAV :"yui-cal-nav",
        /**
         * Class applied to the Calendar/CalendarGroup's bounding box to indicate
         * the Navigator is currently visible
         * @property YAHOO.widget.CalendarNavigator.CLASSES.NAV_VISIBLE
         * @type String
         * @static
         */
        NAV_VISIBLE: "yui-cal-nav-visible",
        /**
         * Class applied to the Navigator mask's bounding box
         * @property YAHOO.widget.CalendarNavigator.CLASSES.MASK
         * @type String
         * @static
         */
        MASK : "yui-cal-nav-mask",
        /**
         * Class applied to the year label/control bounding box
         * @property YAHOO.widget.CalendarNavigator.CLASSES.YEAR
         * @type String
         * @static
         */
        YEAR : "yui-cal-nav-y",
        /**
         * Class applied to the month label/control bounding box
         * @property YAHOO.widget.CalendarNavigator.CLASSES.MONTH
         * @type String
         * @static
         */
        MONTH : "yui-cal-nav-m",
        /**
         * Class applied to the submit/cancel button's bounding box
         * @property YAHOO.widget.CalendarNavigator.CLASSES.BUTTONS
         * @type String
         * @static
         */
        BUTTONS : "yui-cal-nav-b",
        /**
         * Class applied to buttons wrapping element
         * @property YAHOO.widget.CalendarNavigator.CLASSES.BUTTON
         * @type String
         * @static
         */
        BUTTON : "yui-cal-nav-btn",
        /**
         * Class applied to the validation error area's bounding box
         * @property YAHOO.widget.CalendarNavigator.CLASSES.ERROR
         * @type String
         * @static
         */
        ERROR : "yui-cal-nav-e",
        /**
         * Class applied to the year input control
         * @property YAHOO.widget.CalendarNavigator.CLASSES.YEAR_CTRL
         * @type String
         * @static
         */
        YEAR_CTRL : "yui-cal-nav-yc",
        /**
         * Class applied to the month input control
         * @property YAHOO.widget.CalendarNavigator.CLASSES.MONTH_CTRL
         * @type String
         * @static
         */
        MONTH_CTRL : "yui-cal-nav-mc",
        /**
         * Class applied to controls with invalid data (e.g. a year input field with invalid an year)
         * @property YAHOO.widget.CalendarNavigator.CLASSES.INVALID
         * @type String
         * @static
         */
        INVALID : "yui-invalid",
        /**
         * Class applied to default controls
         * @property YAHOO.widget.CalendarNavigator.CLASSES.DEFAULT
         * @type String
         * @static
         */
        DEFAULT : "yui-default"
    };

    /**
     * Object literal containing the default configuration values for the CalendarNavigator
     * The configuration object is expected to follow the format below, with the properties being
     * case sensitive.
     * <dl>
     * <dt>strings</dt>
     * <dd><em>Object</em> :  An object with the properties shown below, defining the string labels to use in the Navigator's UI
     *     <dl>
     *         <dt>month</dt><dd><em>String</em> : The string to use for the month label. Defaults to "Month".</dd>
     *         <dt>year</dt><dd><em>String</em> : The string to use for the year label. Defaults to "Year".</dd>
     *         <dt>submit</dt><dd><em>String</em> : The string to use for the submit button label. Defaults to "Okay".</dd>
     *         <dt>cancel</dt><dd><em>String</em> : The string to use for the cancel button label. Defaults to "Cancel".</dd>
     *         <dt>invalidYear</dt><dd><em>String</em> : The string to use for invalid year values. Defaults to "Year needs to be a number".</dd>
     *     </dl>
     * </dd>
     * <dt>monthFormat</dt><dd><em>String</em> : The month format to use. Either YAHOO.widget.Calendar.LONG, or YAHOO.widget.Calendar.SHORT. Defaults to YAHOO.widget.Calendar.LONG</dd>
     * <dt>initialFocus</dt><dd><em>String</em> : Either "year" or "month" specifying which input control should get initial focus. Defaults to "year"</dd>
     * </dl>
     * @property DEFAULT_CONFIG
     * @type Object
     * @static
     */
    CN.DEFAULT_CONFIG = {
        strings : {
            month: "Month",
            year: "Year",
            submit: "Okay",
            cancel: "Cancel",
            invalidYear : "Year needs to be a number"
        },
        monthFormat: YAHOO.widget.Calendar.LONG,
        initialFocus: "year"
    };
    
    /**
     * Object literal containing the default configuration values for the CalendarNavigator
     * @property _DEFAULT_CFG
     * @protected
     * @deprecated Made public. See the public DEFAULT_CONFIG property
     * @type Object
     * @static
     */
    CN._DEFAULT_CFG = CN.DEFAULT_CONFIG;


    /**
     * The suffix added to the Calendar/CalendarGroup's ID, to generate
     * a unique ID for the Navigator and it's bounding box.
     * @property YAHOO.widget.CalendarNavigator.ID_SUFFIX
     * @static
     * @type String
     * @final
     */
    CN.ID_SUFFIX = "_nav";
    /**
     * The suffix added to the Navigator's ID, to generate
     * a unique ID for the month control.
     * @property YAHOO.widget.CalendarNavigator.MONTH_SUFFIX
     * @static
     * @type String 
     * @final
     */
    CN.MONTH_SUFFIX = "_month";
    /**
     * The suffix added to the Navigator's ID, to generate
     * a unique ID for the year control.
     * @property YAHOO.widget.CalendarNavigator.YEAR_SUFFIX
     * @static
     * @type String
     * @final
     */
    CN.YEAR_SUFFIX = "_year";
    /**
     * The suffix added to the Navigator's ID, to generate
     * a unique ID for the error bounding box.
     * @property YAHOO.widget.CalendarNavigator.ERROR_SUFFIX
     * @static
     * @type String
     * @final
     */
    CN.ERROR_SUFFIX = "_error";
    /**
     * The suffix added to the Navigator's ID, to generate
     * a unique ID for the "Cancel" button.
     * @property YAHOO.widget.CalendarNavigator.CANCEL_SUFFIX
     * @static
     * @type String
     * @final
     */
    CN.CANCEL_SUFFIX = "_cancel";
    /**
     * The suffix added to the Navigator's ID, to generate
     * a unique ID for the "Submit" button.
     * @property YAHOO.widget.CalendarNavigator.SUBMIT_SUFFIX
     * @static
     * @type String
     * @final
     */
    CN.SUBMIT_SUFFIX = "_submit";

    /**
     * The number of digits to which the year input control is to be limited.
     * @property YAHOO.widget.CalendarNavigator.YR_MAX_DIGITS
     * @static
     * @type Number
     */
    CN.YR_MAX_DIGITS = 4;

    /**
     * The amount by which to increment the current year value,
     * when the arrow up/down key is pressed on the year control
     * @property YAHOO.widget.CalendarNavigator.YR_MINOR_INC
     * @static
     * @type Number
     */
    CN.YR_MINOR_INC = 1;

    /**
     * The amount by which to increment the current year value,
     * when the page up/down key is pressed on the year control
     * @property YAHOO.widget.CalendarNavigator.YR_MAJOR_INC
     * @static
     * @type Number
     */
    CN.YR_MAJOR_INC = 10;

    /**
     * Artificial delay (in ms) between the time the Navigator is hidden
     * and the Calendar/CalendarGroup state is updated. Allows the user
     * the see the Calendar/CalendarGroup page changing. If set to 0
     * the Calendar/CalendarGroup page will be updated instantly
     * @property YAHOO.widget.CalendarNavigator.UPDATE_DELAY
     * @static
     * @type Number
     */
    CN.UPDATE_DELAY = 50;

    /**
     * Regular expression used to validate the year input
     * @property YAHOO.widget.CalendarNavigator.YR_PATTERN
     * @static
     * @type RegExp
     */
    CN.YR_PATTERN = /^\d+$/;
    /**
     * Regular expression used to trim strings
     * @property YAHOO.widget.CalendarNavigator.TRIM
     * @static
     * @type RegExp
     */
    CN.TRIM = /^\s*(.*?)\s*$/;
})();

YAHOO.widget.CalendarNavigator.prototype = {

    /**
     * The unique ID for this CalendarNavigator instance
     * @property id
     * @type String
     */
    id : null,

    /**
     * The Calendar/CalendarGroup instance to which the navigator belongs
     * @property cal
     * @type {Calendar|CalendarGroup}
     */
    cal : null,

    /**
     * Reference to the HTMLElement used to render the navigator's bounding box
     * @property navEl
     * @type HTMLElement
     */
    navEl : null,

    /**
     * Reference to the HTMLElement used to render the navigator's mask
     * @property maskEl
     * @type HTMLElement
     */
    maskEl : null,

    /**
     * Reference to the HTMLElement used to input the year
     * @property yearEl
     * @type HTMLElement
     */
    yearEl : null,

    /**
     * Reference to the HTMLElement used to input the month
     * @property monthEl
     * @type HTMLElement
     */
    monthEl : null,

    /**
     * Reference to the HTMLElement used to display validation errors
     * @property errorEl
     * @type HTMLElement
     */
    errorEl : null,

    /**
     * Reference to the HTMLElement used to update the Calendar/Calendar group
     * with the month/year values
     * @property submitEl
     * @type HTMLElement
     */
    submitEl : null,
    
    /**
     * Reference to the HTMLElement used to hide the navigator without updating the 
     * Calendar/Calendar group
     * @property cancelEl
     * @type HTMLElement
     */
    cancelEl : null,

    /** 
     * Reference to the first focusable control in the navigator (by default monthEl)
     * @property firstCtrl
     * @type HTMLElement
     */
    firstCtrl : null,
    
    /** 
     * Reference to the last focusable control in the navigator (by default cancelEl)
     * @property lastCtrl
     * @type HTMLElement
     */
    lastCtrl : null,

    /**
     * The document containing the Calendar/Calendar group instance
     * @protected
     * @property _doc
     * @type HTMLDocument
     */
    _doc : null,

    /**
     * Internal state property for the current year displayed in the navigator
     * @protected
     * @property _year
     * @type Number
     */
    _year: null,
    
    /**
     * Internal state property for the current month index displayed in the navigator
     * @protected
     * @property _month
     * @type Number
     */
    _month: 0,

    /**
     * Private internal state property which indicates whether or not the 
     * Navigator has been rendered.
     * @private
     * @property __rendered
     * @type Boolean
     */
    __rendered: false,

    /**
     * Init lifecycle method called as part of construction
     * 
     * @method init
     * @param {Calendar} cal The instance of the Calendar or CalendarGroup to which this CalendarNavigator should be attached
     */
    init : function(cal) {
        var calBox = cal.oDomContainer;

        this.cal = cal;
        this.id = calBox.id + YAHOO.widget.CalendarNavigator.ID_SUFFIX;
        this._doc = calBox.ownerDocument;

        /**
         * Private flag, to identify IE Quirks
         * @private
         * @property __isIEQuirks
         */
        var ie = YAHOO.env.ua.ie;
        this.__isIEQuirks = (ie && ((ie <= 6) || (this._doc.compatMode == "BackCompat")));
    },

    /**
     * Displays the navigator and mask, updating the input controls to reflect the 
     * currently set month and year. The show method will invoke the render method
     * if the navigator has not been renderered already, allowing for lazy rendering
     * of the control.
     * 
     * The show method will fire the Calendar/CalendarGroup's beforeShowNav and showNav events
     * 
     * @method show
     */
    show : function() {
        var CLASSES = YAHOO.widget.CalendarNavigator.CLASSES;

        if (this.cal.beforeShowNavEvent.fire()) {
            if (!this.__rendered) {
                this.render();
            }
            this.clearErrors();

            this._updateMonthUI();
            this._updateYearUI();
            this._show(this.navEl, true);

            this.setInitialFocus();
            this.showMask();

            YAHOO.util.Dom.addClass(this.cal.oDomContainer, CLASSES.NAV_VISIBLE);
            this.cal.showNavEvent.fire();
        }
    },

    /**
     * Hides the navigator and mask
     * 
     * The show method will fire the Calendar/CalendarGroup's beforeHideNav event and hideNav events
     * @method hide
     */
    hide : function() {
        var CLASSES = YAHOO.widget.CalendarNavigator.CLASSES;

        if (this.cal.beforeHideNavEvent.fire()) {
            this._show(this.navEl, false);
            this.hideMask();
            YAHOO.util.Dom.removeClass(this.cal.oDomContainer, CLASSES.NAV_VISIBLE);
            this.cal.hideNavEvent.fire();
        }
    },
    

    /**
     * Displays the navigator's mask element
     * 
     * @method showMask
     */
    showMask : function() {
        this._show(this.maskEl, true);
        if (this.__isIEQuirks) {
            this._syncMask();
        }
    },

    /**
     * Hides the navigator's mask element
     * 
     * @method hideMask
     */
    hideMask : function() {
        this._show(this.maskEl, false);
    },

    /**
     * Returns the current month set on the navigator
     * 
     * Note: This may not be the month set in the UI, if 
     * the UI contains an invalid value.
     * 
     * @method getMonth
     * @return {Number} The Navigator's current month index
     */
    getMonth: function() {
        return this._month;
    },

    /**
     * Returns the current year set on the navigator
     * 
     * Note: This may not be the year set in the UI, if 
     * the UI contains an invalid value.
     * 
     * @method getYear
     * @return {Number} The Navigator's current year value
     */
    getYear: function() {
        return this._year;
    },

    /**
     * Sets the current month on the Navigator, and updates the UI
     * 
     * @method setMonth
     * @param {Number} nMonth The month index, from 0 (Jan) through 11 (Dec).
     */
    setMonth : function(nMonth) {
        if (nMonth >= 0 && nMonth < 12) {
            this._month = nMonth;
        }
        this._updateMonthUI();
    },

    /**
     * Sets the current year on the Navigator, and updates the UI. If the 
     * provided year is invalid, it will not be set.
     * 
     * @method setYear
     * @param {Number} nYear The full year value to set the Navigator to.
     */
    setYear : function(nYear) {
        var yrPattern = YAHOO.widget.CalendarNavigator.YR_PATTERN;
        if (YAHOO.lang.isNumber(nYear) && yrPattern.test(nYear+"")) {
            this._year = nYear;
        }
        this._updateYearUI();
    },

    /**
     * Renders the HTML for the navigator, adding it to the 
     * document and attaches event listeners if it has not 
     * already been rendered.
     * 
     * @method render
     */
    render: function() {
        this.cal.beforeRenderNavEvent.fire();
        if (!this.__rendered) {
            this.createNav();
            this.createMask();
            this.applyListeners();
            this.__rendered = true;
        }
        this.cal.renderNavEvent.fire();
    },

    /**
     * Creates the navigator's containing HTMLElement, it's contents, and appends 
     * the containg element to the Calendar/CalendarGroup's container.
     * 
     * @method createNav
     */
    createNav : function() {
        var NAV = YAHOO.widget.CalendarNavigator;
        var doc = this._doc;

        var d = doc.createElement("div");
        d.className = NAV.CLASSES.NAV;

        var htmlBuf = this.renderNavContents([]);

        d.innerHTML = htmlBuf.join('');
        this.cal.oDomContainer.appendChild(d);

        this.navEl = d;

        this.yearEl = doc.getElementById(this.id + NAV.YEAR_SUFFIX);
        this.monthEl = doc.getElementById(this.id + NAV.MONTH_SUFFIX);
        this.errorEl = doc.getElementById(this.id + NAV.ERROR_SUFFIX);
        this.submitEl = doc.getElementById(this.id + NAV.SUBMIT_SUFFIX);
        this.cancelEl = doc.getElementById(this.id + NAV.CANCEL_SUFFIX);

        if (YAHOO.env.ua.gecko && this.yearEl && this.yearEl.type == "text") {
            // Avoid XUL error on focus, select [ https://bugzilla.mozilla.org/show_bug.cgi?id=236791, 
            // supposedly fixed in 1.8.1, but there are reports of it still being around for methods other than blur ]
            this.yearEl.setAttribute("autocomplete", "off");
        }

        this._setFirstLastElements();
    },

    /**
     * Creates the Mask HTMLElement and appends it to the Calendar/CalendarGroups
     * container.
     * 
     * @method createMask
     */
    createMask : function() {
        var C = YAHOO.widget.CalendarNavigator.CLASSES;

        var d = this._doc.createElement("div");
        d.className = C.MASK;

        this.cal.oDomContainer.appendChild(d);
        this.maskEl = d;
    },

    /**
     * Used to set the width/height of the mask in pixels to match the Calendar Container.
     * Currently only used for IE6 or IE in quirks mode. The other A-Grade browser are handled using CSS (width/height 100%).
     * <p>
     * The method is also registered as an HTMLElement resize listener on the Calendars container element.
     * </p>
     * @protected
     * @method _syncMask
     */
    _syncMask : function() {
        var c = this.cal.oDomContainer;
        if (c && this.maskEl) {
            var r = YAHOO.util.Dom.getRegion(c);
            YAHOO.util.Dom.setStyle(this.maskEl, "width", r.right - r.left + "px");
            YAHOO.util.Dom.setStyle(this.maskEl, "height", r.bottom - r.top + "px");
        }
    },

    /**
     * Renders the contents of the navigator
     * 
     * @method renderNavContents
     * 
     * @param {Array} html The HTML buffer to append the HTML to.
     * @return {Array} A reference to the buffer passed in.
     */
    renderNavContents : function(html) {
        var NAV = YAHOO.widget.CalendarNavigator,
            C = NAV.CLASSES,
            h = html; // just to use a shorter name

        h[h.length] = '<div class="' + C.MONTH + '">';
        this.renderMonth(h);
        h[h.length] = '</div>';
        h[h.length] = '<div class="' + C.YEAR + '">';
        this.renderYear(h);
        h[h.length] = '</div>';
        h[h.length] = '<div class="' + C.BUTTONS + '">';
        this.renderButtons(h);
        h[h.length] = '</div>';
        h[h.length] = '<div class="' + C.ERROR + '" id="' + this.id + NAV.ERROR_SUFFIX + '"></div>';

        return h;
    },

    /**
     * Renders the month label and control for the navigator
     * 
     * @method renderNavContents
     * @param {Array} html The HTML buffer to append the HTML to.
     * @return {Array} A reference to the buffer passed in.
     */
    renderMonth : function(html) {
        var NAV = YAHOO.widget.CalendarNavigator,
            C = NAV.CLASSES;

        var id = this.id + NAV.MONTH_SUFFIX,
            mf = this.__getCfg("monthFormat"),
            months = this.cal.cfg.getProperty((mf == YAHOO.widget.Calendar.SHORT) ? "MONTHS_SHORT" : "MONTHS_LONG"),
            h = html;

        if (months && months.length > 0) {
            h[h.length] = '<label for="' + id + '">';
            h[h.length] = this.__getCfg("month", true);
            h[h.length] = '</label>';
            h[h.length] = '<select name="' + id + '" id="' + id + '" class="' + C.MONTH_CTRL + '">';
            for (var i = 0; i < months.length; i++) {
                h[h.length] = '<option value="' + i + '">';
                h[h.length] = months[i];
                h[h.length] = '</option>';
            }
            h[h.length] = '</select>';
        }
        return h;
    },

    /**
     * Renders the year label and control for the navigator
     * 
     * @method renderYear
     * @param {Array} html The HTML buffer to append the HTML to.
     * @return {Array} A reference to the buffer passed in.
     */
    renderYear : function(html) {
        var NAV = YAHOO.widget.CalendarNavigator,
            C = NAV.CLASSES;

        var id = this.id + NAV.YEAR_SUFFIX,
            size = NAV.YR_MAX_DIGITS,
            h = html;

        h[h.length] = '<label for="' + id + '">';
        h[h.length] = this.__getCfg("year", true);
        h[h.length] = '</label>';
        h[h.length] = '<input type="text" name="' + id + '" id="' + id + '" class="' + C.YEAR_CTRL + '" maxlength="' + size + '"/>';
        return h;
    },

    /**
     * Renders the submit/cancel buttons for the navigator
     * 
     * @method renderButton
     * @return {String} The HTML created for the Button UI
     */
    renderButtons : function(html) {
        var C = YAHOO.widget.CalendarNavigator.CLASSES;
        var h = html;

        h[h.length] = '<span class="' + C.BUTTON + ' ' + C.DEFAULT + '">';
        h[h.length] = '<button type="button" id="' + this.id + '_submit' + '">';
        h[h.length] = this.__getCfg("submit", true);
        h[h.length] = '</button>';
        h[h.length] = '</span>';
        h[h.length] = '<span class="' + C.BUTTON +'">';
        h[h.length] = '<button type="button" id="' + this.id + '_cancel' + '">';
        h[h.length] = this.__getCfg("cancel", true);
        h[h.length] = '</button>';
        h[h.length] = '</span>';

        return h;
    },

    /**
     * Attaches DOM event listeners to the rendered elements
     * <p>
     * The method will call applyKeyListeners, to setup keyboard specific 
     * listeners
     * </p>
     * @method applyListeners
     */
    applyListeners : function() {
        var E = YAHOO.util.Event;

        function yearUpdateHandler() {
            if (this.validate()) {
                this.setYear(this._getYearFromUI());
            }
        }

        function monthUpdateHandler() {
            this.setMonth(this._getMonthFromUI());
        }

        E.on(this.submitEl, "click", this.submit, this, true);
        E.on(this.cancelEl, "click", this.cancel, this, true);
        E.on(this.yearEl, "blur", yearUpdateHandler, this, true);
        E.on(this.monthEl, "change", monthUpdateHandler, this, true);

        if (this.__isIEQuirks) {
            YAHOO.util.Event.on(this.cal.oDomContainer, "resize", this._syncMask, this, true);
        }

        this.applyKeyListeners();
    },

    /**
     * Removes/purges DOM event listeners from the rendered elements
     * 
     * @method purgeListeners
     */
    purgeListeners : function() {
        var E = YAHOO.util.Event;
        E.removeListener(this.submitEl, "click", this.submit);
        E.removeListener(this.cancelEl, "click", this.cancel);
        E.removeListener(this.yearEl, "blur");
        E.removeListener(this.monthEl, "change");
        if (this.__isIEQuirks) {
            E.removeListener(this.cal.oDomContainer, "resize", this._syncMask);
        }

        this.purgeKeyListeners();
    },

    /**
     * Attaches DOM listeners for keyboard support. 
     * Tab/Shift-Tab looping, Enter Key Submit on Year element,
     * Up/Down/PgUp/PgDown year increment on Year element
     * <p>
     * NOTE: MacOSX Safari 2.x doesn't let you tab to buttons and 
     * MacOSX Gecko does not let you tab to buttons or select controls,
     * so for these browsers, Tab/Shift-Tab looping is limited to the 
     * elements which can be reached using the tab key.
     * </p>
     * @method applyKeyListeners
     */
    applyKeyListeners : function() {
        var E = YAHOO.util.Event,
            ua = YAHOO.env.ua;

        // IE/Safari 3.1 doesn't fire keypress for arrow/pg keys (non-char keys)
        var arrowEvt = (ua.ie || ua.webkit) ? "keydown" : "keypress";

        // - IE/Safari 3.1 doesn't fire keypress for non-char keys
        // - Opera doesn't allow us to cancel keydown or keypress for tab, but 
        //   changes focus successfully on keydown (keypress is too late to change focus - opera's already moved on).
        var tabEvt = (ua.ie || ua.opera || ua.webkit) ? "keydown" : "keypress";

        // Everyone likes keypress for Enter (char keys) - whoo hoo!
        E.on(this.yearEl, "keypress", this._handleEnterKey, this, true);

        E.on(this.yearEl, arrowEvt, this._handleDirectionKeys, this, true);
        E.on(this.lastCtrl, tabEvt, this._handleTabKey, this, true);
        E.on(this.firstCtrl, tabEvt, this._handleShiftTabKey, this, true);
    },

    /**
     * Removes/purges DOM listeners for keyboard support
     *
     * @method purgeKeyListeners
     */
    purgeKeyListeners : function() {
        var E = YAHOO.util.Event,
            ua = YAHOO.env.ua;

        var arrowEvt = (ua.ie || ua.webkit) ? "keydown" : "keypress";
        var tabEvt = (ua.ie || ua.opera || ua.webkit) ? "keydown" : "keypress";

        E.removeListener(this.yearEl, "keypress", this._handleEnterKey);
        E.removeListener(this.yearEl, arrowEvt, this._handleDirectionKeys);
        E.removeListener(this.lastCtrl, tabEvt, this._handleTabKey);
        E.removeListener(this.firstCtrl, tabEvt, this._handleShiftTabKey);
    },

    /**
     * Updates the Calendar/CalendarGroup's pagedate with the currently set month and year if valid.
     * <p>
     * If the currently set month/year is invalid, a validation error will be displayed and the 
     * Calendar/CalendarGroup's pagedate will not be updated.
     * </p>
     * @method submit
     */
    submit : function() {
        if (this.validate()) {
            this.hide();

            this.setMonth(this._getMonthFromUI());
            this.setYear(this._getYearFromUI());

            var cal = this.cal;

            // Artificial delay, just to help the user see something changed
            var delay = YAHOO.widget.CalendarNavigator.UPDATE_DELAY;
            if (delay > 0) {
                var nav = this;
                window.setTimeout(function(){ nav._update(cal); }, delay);
            } else {
                this._update(cal);
            }
        }
    },

    /**
     * Updates the Calendar rendered state, based on the state of the CalendarNavigator
     * @method _update
     * @param cal The Calendar instance to update
     * @protected
     */
    _update : function(cal) {
        var date = YAHOO.widget.DateMath.getDate(this.getYear() - cal.cfg.getProperty("YEAR_OFFSET"), this.getMonth(), 1);
        cal.cfg.setProperty("pagedate", date);
        cal.render();
    },

    /**
     * Hides the navigator and mask, without updating the Calendar/CalendarGroup's state
     * 
     * @method cancel
     */
    cancel : function() {
        this.hide();
    },

    /**
     * Validates the current state of the UI controls
     * 
     * @method validate
     * @return {Boolean} true, if the current UI state contains valid values, false if not
     */
    validate : function() {
        if (this._getYearFromUI() !== null) {
            this.clearErrors();
            return true;
        } else {
            this.setYearError();
            this.setError(this.__getCfg("invalidYear", true));
            return false;
        }
    },

    /**
     * Displays an error message in the Navigator's error panel
     * @method setError
     * @param {String} msg The error message to display
     */
    setError : function(msg) {
        if (this.errorEl) {
            this.errorEl.innerHTML = msg;
            this._show(this.errorEl, true);
        }
    },

    /**
     * Clears the navigator's error message and hides the error panel
     * @method clearError 
     */
    clearError : function() {
        if (this.errorEl) {
            this.errorEl.innerHTML = "";
            this._show(this.errorEl, false);
        }
    },

    /**
     * Displays the validation error UI for the year control
     * @method setYearError
     */
    setYearError : function() {
        YAHOO.util.Dom.addClass(this.yearEl, YAHOO.widget.CalendarNavigator.CLASSES.INVALID);
    },

    /**
     * Removes the validation error UI for the year control
     * @method clearYearError
     */
    clearYearError : function() {
        YAHOO.util.Dom.removeClass(this.yearEl, YAHOO.widget.CalendarNavigator.CLASSES.INVALID);
    },

    /**
     * Clears all validation and error messages in the UI
     * @method clearErrors
     */
    clearErrors : function() {
        this.clearError();
        this.clearYearError();
    },

    /**
     * Sets the initial focus, based on the configured value
     * @method setInitialFocus
     */
    setInitialFocus : function() {
        var el = this.submitEl,
            f = this.__getCfg("initialFocus");

        if (f && f.toLowerCase) {
            f = f.toLowerCase();
            if (f == "year") {
                el = this.yearEl;
                try {
                    this.yearEl.select();
                } catch (selErr) {
                    // Ignore;
                }
            } else if (f == "month") {
                el = this.monthEl;
            }
        }

        if (el && YAHOO.lang.isFunction(el.focus)) {
            try {
                el.focus();
            } catch (focusErr) {
                // TODO: Fall back if focus fails?
            }
        }
    },

    /**
     * Removes all renderered HTML elements for the Navigator from
     * the DOM, purges event listeners and clears (nulls) any property
     * references to HTML references
     * @method erase
     */
    erase : function() {
        if (this.__rendered) {
            this.purgeListeners();

            // Clear out innerHTML references
            this.yearEl = null;
            this.monthEl = null;
            this.errorEl = null;
            this.submitEl = null;
            this.cancelEl = null;
            this.firstCtrl = null;
            this.lastCtrl = null;
            if (this.navEl) {
                this.navEl.innerHTML = "";
            }

            var p = this.navEl.parentNode;
            if (p) {
                p.removeChild(this.navEl);
            }
            this.navEl = null;

            var pm = this.maskEl.parentNode;
            if (pm) {
                pm.removeChild(this.maskEl);
            }
            this.maskEl = null;
            this.__rendered = false;
        }
    },

    /**
     * Destroys the Navigator object and any HTML references
     * @method destroy
     */
    destroy : function() {
        this.erase();
        this._doc = null;
        this.cal = null;
        this.id = null;
    },

    /**
     * Protected implementation to handle how UI elements are 
     * hidden/shown.
     *
     * @method _show
     * @protected
     */
    _show : function(el, bShow) {
        if (el) {
            YAHOO.util.Dom.setStyle(el, "display", (bShow) ? "block" : "none");
        }
    },

    /**
     * Returns the month value (index), from the month UI element
     * @protected
     * @method _getMonthFromUI
     * @return {Number} The month index, or 0 if a UI element for the month
     * is not found
     */
    _getMonthFromUI : function() {
        if (this.monthEl) {
            return this.monthEl.selectedIndex;
        } else {
            return 0; // Default to Jan
        }
    },

    /**
     * Returns the year value, from the Navitator's year UI element
     * @protected
     * @method _getYearFromUI
     * @return {Number} The year value set in the UI, if valid. null is returned if 
     * the UI does not contain a valid year value.
     */
    _getYearFromUI : function() {
        var NAV = YAHOO.widget.CalendarNavigator;

        var yr = null;
        if (this.yearEl) {
            var value = this.yearEl.value;
            value = value.replace(NAV.TRIM, "$1");

            if (NAV.YR_PATTERN.test(value)) {
                yr = parseInt(value, 10);
            }
        }
        return yr;
    },

    /**
     * Updates the Navigator's year UI, based on the year value set on the Navigator object
     * @protected
     * @method _updateYearUI
     */
    _updateYearUI : function() {
        if (this.yearEl && this._year !== null) {
            this.yearEl.value = this._year;
        }
    },

    /**
     * Updates the Navigator's month UI, based on the month value set on the Navigator object
     * @protected
     * @method _updateMonthUI
     */
    _updateMonthUI : function() {
        if (this.monthEl) {
            this.monthEl.selectedIndex = this._month;
        }
    },

    /**
     * Sets up references to the first and last focusable element in the Navigator's UI
     * in terms of tab order (Naviagator's firstEl and lastEl properties). The references
     * are used to control modality by looping around from the first to the last control
     * and visa versa for tab/shift-tab navigation.
     * <p>
     * See <a href="#applyKeyListeners">applyKeyListeners</a>
     * </p>
     * @protected
     * @method _setFirstLastElements
     */
    _setFirstLastElements : function() {
        this.firstCtrl = this.monthEl;
        this.lastCtrl = this.cancelEl;

        // Special handling for MacOSX.
        // - Safari 2.x can't focus on buttons
        // - Gecko can't focus on select boxes or buttons
        if (this.__isMac) {
            if (YAHOO.env.ua.webkit && YAHOO.env.ua.webkit < 420){
                this.firstCtrl = this.monthEl;
                this.lastCtrl = this.yearEl;
            }
            if (YAHOO.env.ua.gecko) {
                this.firstCtrl = this.yearEl;
                this.lastCtrl = this.yearEl;
            }
        }
    },

    /**
     * Default Keyboard event handler to capture Enter 
     * on the Navigator's year control (yearEl)
     * 
     * @method _handleEnterKey
     * @protected
     * @param {Event} e The DOM event being handled
     */
    _handleEnterKey : function(e) {
        var KEYS = YAHOO.util.KeyListener.KEY;

        if (YAHOO.util.Event.getCharCode(e) == KEYS.ENTER) {
            YAHOO.util.Event.preventDefault(e);
            this.submit();
        }
    },

    /**
     * Default Keyboard event handler to capture up/down/pgup/pgdown
     * on the Navigator's year control (yearEl).
     * 
     * @method _handleDirectionKeys
     * @protected
     * @param {Event} e The DOM event being handled
     */
    _handleDirectionKeys : function(e) {
        var E = YAHOO.util.Event,
            KEYS = YAHOO.util.KeyListener.KEY,
            NAV = YAHOO.widget.CalendarNavigator;

        var value = (this.yearEl.value) ? parseInt(this.yearEl.value, 10) : null;
        if (isFinite(value)) {
            var dir = false;
            switch(E.getCharCode(e)) {
                case KEYS.UP:
                    this.yearEl.value = value + NAV.YR_MINOR_INC;
                    dir = true;
                    break;
                case KEYS.DOWN:
                    this.yearEl.value = Math.max(value - NAV.YR_MINOR_INC, 0);
                    dir = true;
                    break;
                case KEYS.PAGE_UP:
                    this.yearEl.value = value + NAV.YR_MAJOR_INC;
                    dir = true;
                    break;
                case KEYS.PAGE_DOWN:
                    this.yearEl.value = Math.max(value - NAV.YR_MAJOR_INC, 0);
                    dir = true;
                    break;
                default:
                    break;
            }
            if (dir) {
                E.preventDefault(e);
                try {
                    this.yearEl.select();
                } catch(err) {
                    // Ignore
                }
            }
        }
    },

    /**
     * Default Keyboard event handler to capture Tab 
     * on the last control (lastCtrl) in the Navigator.
     * 
     * @method _handleTabKey
     * @protected
     * @param {Event} e The DOM event being handled
     */
    _handleTabKey : function(e) {
        var E = YAHOO.util.Event,
            KEYS = YAHOO.util.KeyListener.KEY;

        if (E.getCharCode(e) == KEYS.TAB && !e.shiftKey) {
            try {
                E.preventDefault(e);
                this.firstCtrl.focus();
            } catch (err) {
                // Ignore - mainly for focus edge cases
            }
        }
    },

    /**
     * Default Keyboard event handler to capture Shift-Tab 
     * on the first control (firstCtrl) in the Navigator.
     * 
     * @method _handleShiftTabKey
     * @protected
     * @param {Event} e The DOM event being handled
     */
    _handleShiftTabKey : function(e) {
        var E = YAHOO.util.Event,
            KEYS = YAHOO.util.KeyListener.KEY;

        if (e.shiftKey && E.getCharCode(e) == KEYS.TAB) {
            try {
                E.preventDefault(e);
                this.lastCtrl.focus();
            } catch (err) {
                // Ignore - mainly for focus edge cases
            }
        }
    },

    /**
     * Retrieve Navigator configuration values from 
     * the parent Calendar/CalendarGroup's config value.
     * <p>
     * If it has not been set in the user provided configuration, the method will 
     * return the default value of the configuration property, as set in DEFAULT_CONFIG
     * </p>
     * @private
     * @method __getCfg
     * @param {String} Case sensitive property name.
     * @param {Boolean} true, if the property is a string property, false if not.
     * @return The value of the configuration property
     */
    __getCfg : function(prop, bIsStr) {
        var DEF_CFG = YAHOO.widget.CalendarNavigator.DEFAULT_CONFIG;
        var cfg = this.cal.cfg.getProperty("navigator");

        if (bIsStr) {
            return (cfg !== true && cfg.strings && cfg.strings[prop]) ? cfg.strings[prop] : DEF_CFG.strings[prop];
        } else {
            return (cfg !== true && cfg[prop]) ? cfg[prop] : DEF_CFG[prop];
        }
    },

    /**
     * Private flag, to identify MacOS
     * @private
     * @property __isMac
     */
    __isMac : (navigator.userAgent.toLowerCase().indexOf("macintosh") != -1)

};
YAHOO.register("calendar", YAHOO.widget.Calendar, {version: "2.8.2r1", build: "7"});