How do I get audio from my macbook pro through my samsung tv?

I have a dvi to hdmi cable hooked up from my macbook pro to my samsung hdtv flat screen, so I am getting the video from my macbook, but can’t get the audio from my macbook pro to go through my tv speakers (or my integra dtr 7.7 receiver). I bought a headphone to microphone input jack, but still can’t get the audio. Can anyone help me? Thanks.