iPhone App Help - Playing sounds.

Hi there, I need to add the ability to play sounds in my iPhone Project. Its basically a web browser. I want to make a call from within the page that is being served to play a sound that exists in the local app bundle. I've tried following a few tutorials, but have had no luck. I want to be able to have a javascript function that i can call in-page that the app will pick up.? While i cant share the entire app, i'll be able to copy and paste code. having AIM or another instant messaging service would be useful.