.

I'm assuming some other agency controls the popup and banner ads, not the admins of the forum itself. What was the popup advertising?

E-mail todd@sitcomsonline.com with details, including which ad it was that launched the trojan, and he'll have a look.

There's a maximum of one pop-under per page, especially on the main page.

Do you have it set to display a pop-up notification when you have new private messages?