I've asked this in another question where we could not solve it
Filling the top part of this window?
and now I've got the faulty code in a fiddle that we can debug: http://jsfiddle.net/qffh5/6/
In internet explorer 9 the top of the window is not filling all the way. I suspect that CSS is being overridden so I looked in IE with the developer tools but couldn't find what was wrong: