BuddyPress.org

Hey thanks for the response!

As for the use of z-index:

The wordpress template has a horizontal top menu bar, with drop down category lists.

When opened in IE7 and I hover over a category name in the top horizontal menu bar, the drop down menus drop down however they drop behind the page elements.

The z-index in the header brings the drop down menu to the front of the page where it needs to be in order to make selections.