I think IQ wants it 100% width, also text links aren't centralised on the white bg - maybe the top left tab should join the image below but i'm not sure

To be honest you need to completely rewrite that top table imo - there are a few issues, there are div tags closing before td's, colspan's don't match up.

Got it working here - http://www.whatgwan.com/faction

But if you want to use you'll have to grab the images and re-export the topbg.jpg as a swf (though in this instance an animated gif would be purrfect)