The z-index is almost certainly working, but only for the height of the main menu items, not the drop down menus.
I don't have much confidence that anything can work but you could try one of these:-
- Make the "drop down" menus "drop up" by changing the positions from positive to negative in the Dynamic Drive javascript (I know this would be possible but I'm not good with javascript so you would have to take advice).
- Leave space above the scrolling images.
Code downloaded to my PC will be deleted in due course.
WIN7; IE9, Firefox, Opera, Chrome and Safari for Windows; screen resolution usually 1366*768.
Also IE6 on W98 with 800*600 and IE8 on Vista 1440*900.