/usr/share/syslinux/themes/debian-squeeze/isolinux-live/menu.cfg is in syslinux-themes-debian-squeeze 12-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | menu hshift 0
menu width 82
menu title Boot menu
include stdmenu.cfg
include live.cfg
menu separator
menu begin other
menu title Other options
include stdmenu.cfg
label mainmenu
menu label ^Back..
menu exit
include other.cfg
menu end
|