I'm not seeing it (blocker: disabled), but I guess that maybe depends on which cached server I'm using? Or perhaps your browser is infected?

Try this:

1) Clear browser cache/cookies.
2) Go back to forums.
3) See if it happens again after an hour or two.
4) If so, paste the contents of this javascript here in the forums:

http://www.opserver.de/ubb7/ubb_js/image.js

I want to know if you are seeing the evil line of code from your browser.