hooking mp3 player up to a car.

[steelcmg]

So i got a new car and i dont want to put my cdplayer in there because it would be a pain in the butt. The whole dash is one piece and it has a cd player already in the car. But i want to have my mp3 player work again in my car. Is there a simple way for me to do this. Since the car does not have any inputs on the radio and it doesnt have a tape player.