[evenmonkeys]

Styles & Templates => Style Manager => All Style Options => {Header Template}

Should be the very first template on the top. I'm assuming you're using the fluid style. Replace that header template with the following:

<!-- logo -->
<a name="top"></a>
<table border="0" width="$stylevar[outertablewidth]" cellpadding="0" cellspacing="0" align="center" width="100%">
<tr>
	<td background="images/kirsch/misc/banner_02.jpg" align="center"><a href="$vboptions[forumhome].php$session[sessionurl_q]"><img src="$stylevar[titleimage]" border="0" alt="$vboptions[bbtitle]" /></a></td>
</tr>
</table>
<!-- /logo -->

<!-- content table -->
$spacer_open

$_phpinclude_output