I also recently found two unwanted popup ads on my site which I also couldn't believe. I found that it only displayed when I viewed it with Firefox 3 Beta 5... On all other browsers I haven't ever seen any form of ad on my site.
It could be that someone planted some ads or in the case of a free host (which I don't think you have?) they might have changed their "no-ads" policy and included ads. In the former case I'd log on to your FTP account and check your pages if it hasn't by some means gotten any unwanted "injected" code or perhaps some other stuff on your account?
Good luck!
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