Sorry to hear it happens to you, Girsempa.
I'm with Pushinfasers here, go straight to the ISP and send them a nice little cease and desist letter. If you feel adventurous, you can send that dude who "shoplifted" your image a bill about a fee for using your image :)

It's called copyright (not copywrite, copyrite or whatever funny combinations I have seen) for a reason: the right to copy, in this case his right to copy your image, and you as the original creator have the last say how and who can use your image. nod