Q: Audio output to Sony KDL TV

Well i'm progressing with my connecting the Mac to the TV... Have the video going fine with the Mini DVI to HDMI but for the life of me I can't get the audio output going. I have the 3.5mm RCA jack cable in the output from the Mac and the computer has recognized that it's plugged in and comes up at headphones. Now the problem is getting the TV recognize the audio input.

I've read elsewhere that there should be a way to set the TV to allow a video HDMI input along with an analouge audio signal.

Does anyone here know how to do that?!

Thanks :-)