Trojan on my forum?
 

All of the sudden I'm getting antivirus warnings:

2/18/2010 9:59:28 PM Denied: HEUR:Trojan.Script.Iframer Firefox http://mtwow.servehttp.com//ml.php//ml

With adblock it shows it as a 1x1 frame at the bottom of the page. I've looked through the source, the ftp, and the templates and I don't see that anywhere, but it comes up on every page except the admin panel.

I'm using noscript to block it on my system, but I need to fix this.