Audio Systems: Playing dvd through back speakers only, wireless headphones, dual source

Question
I purchased a van with a lcd drop down dvd player for back passenges.
Although, When I play the dvd through the fm (88.7) it plays through all the speakers.
I am wondering if their is a way to have the dvd play through the back speakers only?
While playing cd/radio on front speakers.

Please help:  Tired of hearing "I love you, You love Me where a happy family....."

Answer
not that simple
you need to replace the radio with a dual source unit
very expensive the best way will be to install this into the dvd it takes only 2 wires and 2 jacks
good luck

http://cgi.ebay.com/2-Boss-Audio-Wireless-Headphones-Head-phones-4-Car-SUV_W0QQi...