Audio Systems: 2003 Ford Taurus, ford aux input, taurus aux input

Question
I'm looking to install something to play my Creative Zen Microphoto through my car (2003 Ford Taurus) stereo.  I have no idea what kind of adapter to buy and would appreciate any help.  My brother is a mechanic and will install it himself.  I don't know how much this will cost, but would like to stay under $150/$200 if at all possible.  Any tips?  Thank you.

Answer
This is the best Ford Taurus auxiliary audio input adapter it plugs in to your brain amplifier ford rcu that is in the  left side of the trunk behind the carpet if you need more information e-mail me again   Ford Taurus aux mp3 input