wbm2005

I just recently purchased the F90 and two LCD headrests for the back seat. I can play a DVD and pipe it back to the headrest just fine. However, I would like to have the DVD player playing in the background continuing to send the DVD signal through the A/V outputs so my kids can enjoy a movie via headphones, while I enjoy the radio/ipod/whatever on the car's speakers. Does anyone have any ideas on how I can make this work?