I had an issue with thickbox where it would show the image behind a flash video in FireFox. IE7 worked great. I ran across Sheriar Designs Blog posting a fix specifically for DHTML menus over a flash video. I figured I would give it a try and much to my surprise, the suggestion worked! I give ALL CREDIT to the author of the blog, Mani (Pronounced like Bonnie, not Mani like Danny)