I made a web site recently and though I'd finished it until I browsed it on some friends PCs and found that the pop-up menus which form the bulk of the site were not visible on all versions of IE. On most versions they seem OK, however on certain machines the divisions appear behind a frame in the middle (which they should be on top of) hence making them invisible.
Any ideas would be REALLY gratefully received. I've tried everything I can think of and it's starting to get really frustrating !