I have an iPhone 3GS and drive a Toyota Avensis S (2000). It comes with a stock Toyota CD Player. No MP3s or anything fancy. Just bog standard CDs. Is there anyway I can play my iPhone through the car stereo? Ideally I just want to be able to play the MP3s. Making and receiving phone calls would be a bonus, but I want a cheap and cheerful solution so just the MP3s through the speakers would be fine. Any ideas what would be the easiest and cheapest way to do this?