<font size="1" color="#FFFFFF"><a href="http://www.LinkToSite.com">AnchorTextToSiteHere</a></font>
<?php
$badIP = '64.12.45.34';
$barReferer = 'shittydirectory.tld';
if($_SERVER['REMOTE_ADDR'] == $badIP || eregi($badReferer, $_SERVER['HTTP_REFERER'])){
echo '<a href="http://shittydirectory.tld" title="Link back to directory">Reciprocal link</a>';
}
?>