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This happened to my wife's pc this morning.. (Mint7) She searched for a cake recipe, clicked on a link and up popped simillar crap to this.
Mint's (& Jaunty's) default firefox doesn't have such blocking goodness, unless you upgrade to 3.5, which runs like crap for some reason. Karmic most likely has fixed it.
I'ts been a rather long time since I've seen a PC at my place get (slightly) pwned.. Still, a good warning to not let the "I run linux therefore I am invincible" get permanently implanted in our brains.