I should also add that while it does block nearly all of them on this site, it occasionally lets one of them through.
I don't want to say which one it is, because if I were George and his crack team of programmers, I would then look at that page and see what was different about it and then make all of the popups like that.
Also, if you look at http://www.myie2.com/html_en/home.htm - that also blocks banner ads (but I haven't tried it, so I don't know if it is only certain ones from well known ad servers).