In archives.
I've placed an AdSense-Leaderbord there (
http://www.planet-liebe.de/vbb/archive/index.php). If you also want smth. like this you can use:
In global.php (in archives) FIND
PHP Code:
{
$extra = '<div class="pda"><a href="?pda=1">' . $vbphrase['pda'] . "</a></div>\n";
}
BELOW that ADD
PHP Code:
$extra .= '<div style="text-align: center; margin: 10px"><!-- Place Ad Code here --></div>';