You could try this
HTML Code:
<!-- logo -->
<a name="top"></a>
<table border="0" width="100%" cellpadding="0" cellspacing="0" align="center"><a href="$vboptions[forumhome].php$session[sessionurl_q]">
<tr>
<td>
<table border="0" width="$stylevar[outertablewidth]" cellpadding="0" cellspacing="0" align="center">
<tr>
<td align="left" valign="top"><a href="$vboptions[forumhome].php$session[sessionurl_q]"><img src="$stylevar[titleimage]/header_end.gif" border="0" alt="$vboptions[bbtitle]" /></a></td>
<td align="center" width="100%" height="300" valign="top"><a href="$vboptions[forumhome].php$session[sessionurl_q]">
<table width="100%" border="0" cellspacing="0" cellpadding="0" style="background: url($stylevar[titleimage]/header_fill.gif) repeat-x top left;" valign="top">
<tr>
<td align="center" border="0" valign="top">
<img src="$stylevar[titleimage]/quarter_midget.gif" border="0"/>
</td>
</tr>
</table>
</a></td>
<td align="right" valign="top"><img src="$stylevar[titleimage]/header_end.gif" border="0" alt="$vboptions[bbtitle]" /></td>
</tr>
</a></table>
<!-- /logo -->
<!-- content table -->
<!-- $spacer_open -->
$_phpinclude_output
$ad_location[ad_header_end]