iTrip is your best bet, not the best for sound quality. But cheapest.
Unless u can get a ipod link adapter cable. I got one for my gfs Honda Jazz and works a dream. But cost about £70
guess no 1 knows too
what i did is buy an aftermarket headunit,
if you have an update list, there is a lead you can purchase, (someone was selling them on here)
and it fits into the back of the standard HU.