I have designed a website ( http://www.trekstation.be/untildawn/index.php ) that is valid to xhtml and css standards. But there is an unexplainable (to me at least) flickering on the site, when I open it in Mozilla and Firefox. Opera displays it correct, IE also (ok, not really correct, but without the flicker.)
I really have no idea why. So it would be great if you checked it out and find the mistake.