I'm not an expert on site hacking (if that's what's going on), but there could be something in a template like an image or link to some file on that site. I think I'd use something to see what the request is for, like FireFox with the TamperData add-on (or maybe someone else knows of an alternative). Then if you can figure out what's being requested from that site, you can search around to figure out where it's coming from. (It looks like your forum is closed or else I would have tried it myself).
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