My MP4 digital player works perfectly with my headset or connected to my computer. I want to use it with my car radio but have a problem. The jack slot on my car radio is a 3.5 slot and the slot on the MP4 player is a jack slot but it is slightly smaller than a 3.5 one. Does an audio cable or an adapter exist so I could have a 3.5 jack on one end for the car and the other smaller one for the MP4 playeron the other end? I looked on "Audio Cables" with google but can't find anything. Can anyone help please?