that depends on where you want to put the ad
for top right where looks like you tried to put it edit header
find:
PHP Code:
<td align="$stylevar[right]">
under add:
PHP Code:
<!-- Begin: AdBrite -->
<script type="text/javascript">
var AdBrite_Title_Color = '0000FF';
var AdBrite_Text_Color = '000000';
var AdBrite_Background_Color = 'FFFFFF';
var AdBrite_Border_Color = 'FFFFFF';
</script>
<script src="http://ads.adbrite.com/mb/text_group.php?sid=178944" type="text/javascript"></script><!--
--><a href="http://www.adbrite.com/mb/commerce/purchase_form.php?opid=178944&afsid=1"><img src="http://www.adbrite.com/mb/images/adbrite-your-ad-here-banner.gif" style="background-color:#FFFFFF" alt="Your Ad Here" width="11" height="60" border="0"></a>
<!-- End: AdBrite -->
should be done