Code:
<!-- logo -->
<a name="top"></a>
<br />
<table border="0" width="$stylevar[outertablewidth]" cellpadding="0" cellspacing="0" align="center">
<tr>
<td bgcolor="#FFFFFF" align="center"><a href="$vboptions[forumhome].php$session[sessionurl_q]"><img src="$stylevar[titleimage]" border="0" alt="$vboptions[bbtitle]" /></a></td>
<td bgcolor="#FFFFFF" align="$stylevar[right]" id="header_right_cell">
<if condition="$ad_location['ad_header_logo']">$ad_location[ad_header_logo]<else /> </if>
</td>
</tr>
<tr>
<td colspan="2" style="background-image:url(images/feelingblues/misc/header_line.jpg); background-repeat:no-repeat; background-position:right; background-color:#FFFFFF;" height="25">
</td>
</tr>
</table>
<!-- /logo -->
<!-- content table -->
$spacer_open
$_phpinclude_output
this should center the logo