Dr Smith.

You may want to also look at the Dietz interface. It offers a similar solution to the others mentioned here, however does allow the external video to be selected (or not selected as the case may be, regardless of if the source video is available .ie DVD playing) with a button on the NAV Screen. The clock button to be exact. No new menu item appears. Its just done by pushing the clock button momentarily.

You can find out more info here

Dietz multimedia interface

They have a distributor in the USA:

Perzan Auto Radio INC.
6409 Market St
Upper Darby, PA 19082
phone +1 (610734) 1234
fax +1 (610734) 1854
[email protected]

I personally dont have one of these, but am currently looking into it .... just thought I would mention it !

Cheers, Adrian