header problem

Hi, I’m not sure about that, but usually, the image related css-stuff is handled in index.php of the theme and not in its style.css because of loading problems.

The reason is not that clear to me (except that you can use an absolute path) … but it can maybe solve your problem.

btw: Your page is not xhtml 1.0 compliant, you should’t link to the validator. Or better: You should fix the xhtml issues.