[Sinistra]

If your site is using tables you can add your forum into a new templade Put the opening table code in the header and the finishing table code in the footer. so here is how it would look

Header code

<table width="100%"  cellpadding="0" cellspacing="0">
<tr>
<td>Logo info gose here and navebar if  you have a custon navbar</td>
<td>
<!-- content table -->
$spacer_open

$_phpinclude_output

Footer Code
at the bottom of all the HTML put

</td>
<td>the rest of your site footer will go here</td>
</tr>
</table>

sorry I don't have an exaple to show you but this should help you out in some way ^_^