z-index with position absolute vs. IE

[xerox]

Can someone please help me with this problem i am having with my menu ? THe problem is only in IE in compatibility mode. I have the menu with position absolute and z-index 99999999 but still the menu is hidden behond the content. Please check :http://www.tomasdostal.com/projects/modul16/draft2/?page=buildingsThanks for any advice