You seem to have clicked 'okay'. Bit late perhaps to remind you this is not a wise thing to do with sites you don't know and Craigs list is not unknown for diversions like this. Nor do you have your pop up blocker on ... or private browsing?
First things first; If you have clam XAV scan your system. If you haven't, download it (It's free) ... and scan your system.
Oh, and read this ...Mac OS X Snow Leopard and malware detection
Message was edited by: seventy one