I've got a similar problem. I have a horizontal menu, works great in IE7 and FF, but the flyout/drop down portion of the menu doesn't appear in IE6. I have the javascript folder in my project, I have IE6 specific style sheet reading correctly... the menu detects the style sheets, and shows the initial row of menu items, but when you hover over them, they don't fly out.
Looking at the source code, the flyout menu items are there, they're just not displaying on hover. By looking at the feedback above, I'm assuming that the javascript is not being hit. However, I dropped an alert statement into the menu javascript hover call and it popups on hover.... so now I'm going through double checking on what I might be missing.
I'll continue to debug, but man this is driving me nuts. Any thoughts or ideas on what else I might have taken out of my project or missed? I'm running IE6 - 6.0.29 SP2, and the demo/sample menu DOES load... so I know its my code or my implementation. I would start over and build from scratch, but it will take forever, so I'm leaving that as a last resort.
Imagination is more important than knowledge. -- Albert Einstein