CSS Drop-down issue in IE7

Hello,

I am having issues with my CSS dropdowns in IE7. They display
alight,
but the menu disappears when you get past the 2nd item on the list.
The menus use a nested list structure and work fine in IE6 and FF.
Any ideas?

Pay attention to the"products" menu:

http://www.storyfilms.net/JDM/JDM.php
http://www.storyfilms.net/JDM/JDMSTYLES.css


Any help would be great, thanks!

Matt