Ipod Interface for Mazda 3

My buddy has a Mazda 3 and wants to do a Ipod interface to the factory head unit. He has the aux button on the deck so I would assume that some one has made a direct interface so he can control the unit through the deck and steering wheel controls as well as the obvious advantage of a direct hook up for sound. Anyways, does anyone know where I can get one of these. I dont sell any and cant seem to find a provider so if I need to buy it over the net thats fine or if someone has a shop and wants to sell one thats cool to.double-secret reverse-osmosis speaker-cone-induced high-level interference distortion, Its a killer

try this ipod interfaceProve your connections, use a meter!

I promise, I'll behave!