Navigation using VTR

Hi,
I have got an imported 2001 mitsubishi Chariot Grandis. Few weeks ago i bought a Nokia 96 mobile. I have managed to connect the phone to the TV in my car. I can now watch videos and listen music from my phone. I can also use the Nokia maps in my car tv screen. But the problem is video goes blank when i am driving the car. Does anybody know how to disable this, so that the video doesn't go blank when i am driving and i can use the phone navigation in my car screen.

Any help will be appreciated.

Thanks

Shimul