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Maybe it's an hack that shows up only for every 10th visitor or so, that's already pretty common these days cause it makes it harder for the site owner to track it down.
I've not visited the site, so I don't know which script's you're using, but many TGPs/MGPs get hacked lately. Go take a close look at your toplist templates, cause they're often used to insert malicious code, and check which files have been changed/updated on your server within the last 48h. If someone has hacked your site he most likely added or updated a file, and didn't change the timestamp.
Oh, and if you've found out what happend please post it on the boards, so we can take care of our sites too ;)
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