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If your profile website is the one you are talking about it doesn't look as though you have anything in your stylesheet to define the header background. You can find the stylsheet in the www.yrousite.com/themes/(theme you are using)folder. The style.css file.
If you want you can define it there then ad it to your theme in the table cell. Or you could just add it to the table cell in your theme. Or in the <div>.
<td width="100%" align="center" style="background-color: #xxxxxx;"><div style="text-align: center; padding-top: 5px;"><div><a href="http://www.bondsscheidsrechter.nl/banners.php?op=click&bid=3" target="_blank"><img src="http://www.bondsscheidsrechter.nl/images/banners/IMG_banner.gif" alt="" /></a></div></div></td>
Hope this helps ya,
Quest