Update: I caught it in the act....
<body leftmargin="0" topmargin="0"><script language='JavaScript' type='text/javascript' src='pfatc.
js'></script>
That
JS line is not part of the original file. Alas the
JS didn't end up in my cache cause it stalled in Firefox. The file was gone by the time I checked the FTP, and the reference itself is gone now too. Other sites on our server are affected.