[jQuery] PHPAds JS interfering with JQuery?

[jQuery] PHPAds JS interfering with JQuery?

Does anybody have ideas as to why Javascript from PHPAds(sample below)
could or would interfere with JQuery?
I just dropped a set of zone scripts into a site I'm working on, and all
of my JQuery(+ Thickbox) stuff has mysteriously stopped working.
Neither Firefox nor IE are throwing errors or even warnings of any sort.
The effects simply stop working, until I remove the PHPAds scripting.
I'm trying to narrow it down to see if a specific instance of the code
is doing it, but this has been inconclusive so far.
<script language='JavaScript' type='text/javascript'
src='http://static.fmpub.net/js/1/adx.js'></script>
<script language='JavaScript' type='text/javascript'>
<!--
if (!document.phpAds_used) document.phpAds_used = ',';
phpAds_random = new String (Math.random());
phpAds_random = phpAds_random.substring(2,11);
document.write ("<" + "script language='JavaScript'
type='text/javascript' src='");
document.write
("http://dynamic.fmpub.net/adjs.php?n=" + phpAds_random);
document.write
("&amp;what=zone:334&amp;block=1&amp;blockcampaign=1");    
document.write ("&amp;exclude=" + document.phpAds_used);
if (document.referrer)
document.write ("&amp;referer=" +
escape(document.referrer));
document.write ("'><" + "/script>");
//-->
</script><noscript><a
href='http://dynamic.fmpub.net/adclick.php?n=ad62954b'
target='_blank'><img
src='http://dynamic.fmpub.net/adview.php?what=zone:334&amp;n=ad62954b'
border='0' alt='' /></a></noscript>
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