Drop Down Menu Problem =(

Hey Fellow Flash Users,
I Have created a Drop Down Menu for a website, Applied the Action Script to the buttons with sub menus, and only 2 work ONCE ! If you go through and click on them one time each they drop down a sub menu as required but then they all become inactive after that? I need to know why this is so, if you could please have a look at the Drop Down menu and tell me my problems in my actionscript that would be greatly appreciated!

here are the links just Right Click, Save Target As:
[COLOR=#0000ff]http://www.dkgcreative.com.au/flash/main_menu.fla[/COLOR]

[COLOR=#810081]http://www.dkgcreative.com.au/flash/main_menu.swf[/COLOR]

Thankyou Jimmy :hurt: