Hi,
Here's a link that shows the problem: http://xotics.equivalenceclass.com/test.php
In IE7 it opens behind the blue "home-banner" and "home-banner-wrapper" DIV. I'm not sure why. When removing the background image for "home-banner", but I don't believe that this solves the problem. I tried playing with the z-index CSS properties of the elements to no avail.