How do I get audio from my TV to a stereo, while still keeping the video feed?

I have a sharp 42 lcd hdtv, and a iLive iPod/iPhone radio/stereo system. I've been trying to get the audio from my TV (from my PS3) to play out to the stereo while still keeping the video feed on the TV. This wouldn't be so hard except for the fact that i'm using an HDMI cable for my PS3 so I can't just plug the yellow chord into the TV and others into the stereo.

I've tried using an iPod chord (the one with the headphone jack on both ends) and I've tried plugging in the audio chords (red and white ones) from the stereo to the TV with the PS3 connected to the TV.

Any help would be appreciated!