v1.0	Initial version.
v1.1	Added class name alteration to menu's enclosing LI tag.
v1.2	Add TreeMenu.show() and TreeMenu.hide() methods.
v1.3	Add TreeMenu.show_all(),TreeMenu.hide_all(), and TreeMenu.reset() methods.
	Added dir.php file listing example.
v1.31	Modified cookie to allow more menu states.
v1.4	Allow img tag symbols for simultaneous background/forground images adjustment.
	Added TreeMenu.Singular flag so only one menu is open at a time.
	Added TreeMenu.OmitSymbols flag to prevent symbols from being added to menu.
	Added TreeMenu.SetupMenu flag to allow server to pre-setup menu.