Received message in Safari about suspicious programs?

In Safari, I had a message with the Safari logo pop up that said: 
"http://velikopopovecky.osa.pl
Caution!  Your computer contains a variety of suspicious programs. Your System requires immediate checking!  The system will perform a fast and fre check your PC for malicious programs."
I tried to quit Safari and it didn't quit, so then I went to Restart and it wouldn't let me. I took a screen shot of ther message and then Forced Quit Safari. 
Do any of you know what this was?  I'm guessing it's not legit, if for no other reason than Apple would never say: fast and free check your PC."  It would say Mac instead of PC, and would get the grammar correct (i.e. of your PC, not PC).
Any insights?  I couldn't find anything useful in a google search.

22 Oct 2011,
running macbookpro, snow leopard; got the same thing doing a search for mac compatibility on Safari.
I was unable to quit or to force quit safari;  closed out everything else which was open;
still, I was unable to shutdown or restart without clicking on the 'ok' of the pop up.
here is the screenshot i took:
In the interim, I was able to open and  run mozilla and found this post of yours; thanks. allayed the panic.
decided to go ahead and click on the 'ok' because nothing else I knew to do was working.
I was then able to force quit and hoped that a restart would make it all right again.
so far, so good. I hope.
is the conclusion that this is 'harmless'?
thanks again. mcm

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