/* PHP CODE HERE */
/* BODY HERE */
$body = <<<EOF
<div align="center">
<script language='JavaScript' type='text/javascript' src='http://www.pondboss.com/asr/adx.js'></script>
<script language='JavaScript' type='text/javascript'>
<!--
if (!document.phpAds_used) document.phpAds_used = ',';
-->
</div>
EOF;
Two issues, you started a comment (<!--) but never closed it (-->). Also, you started a center tag, but never properly closed it either (you had center/ vs /center), I prefer using a div.
