I don't believe there is an elegant, wireless solution for you. Apple TV doesn't actually show your computer's display, it just streams files to the television. You probably need to get an adaptor to plug into the display port to convert to DVI, and then plug a DVI cable from there to your television. I think if you want audio you also need to run a cable from the audio-out port to your tv or other speakers. I know Intel has come up with some wireless display to TV methods, but it isn't in any Mac yet.