How do you convert your nav to TV. I.E. Hook up an X-box, DVD, or computer??

http://www.nav-tv.com/
very expensive

Thanx!!

This one is much better: www.tvonnav.com
The wiring is much cleaner and allows you to change channels with the steering wheel controls... and it's cheaper.

Here's a COMPARISON (http://bimmer.roadfly.org/bmw/forums/e53/forum.php?postid=4521284&page=1)

wow aus thats real hot thanks, have you seen this in person? how is it, ive seen navtv in person and the tv tuner is real fuzzy when driving, maybe in time someone will set up a gb???