Z-index / IE issues

I've gone through several of开发者_C百科 the posts here & elsewhere regarding IE's handling of z-index contexts and could use an extra set of eyes.

the site in question is:

I'm trying to get the #site-index span a tags to sit on top of the image header in the #branding element.

taking a look at the code, you will see I've taken a few stabs at the positioning and z-index stacking for the whole chain of DOM elements inside of Branding but IE is still fussing.

Does anything appear out of place or otherwise suffering from an obvious ommision or eror?

Thanks in advance.

There's no URL in your post but it sounds like you may need to stick a z-index on the #branding element even if it's using relative positioning.