Hi,
The first thing I would suggest is to fix your validation errors.
The second thing I would suggest is to clean out all your IE CC’s on the html element. I can’t imagine why you would need all of that. True you may need to give IE6/7 some special attention with “haslayout” triggers but you should not be needing to target every version of IE separately.
It’s also best not to run compatibility mode either COLOR=Black[/COLOR].
Sorry, but I was afraid to look any further than that.
I will say this though, a lot of times if you fix one error it will fix several others automatically.
When viewing in IE 7/8/9 you will see that the top-right corners of the buttons are messed up as well as the hovering.
After looking at this further it was a lack of “haslayout” after all. You need to trip “haslayout” on the #tabnav div since it contains floats in the ul#dash-nav.