HELP needed! bmw tv tuner + video ipod in a mini cooper

[boxednfresh]

i reas somewhere thatthis could be done.

iv got an bmw tv tuner module and a video ipod. i would like to connect these so that i can watch a movie thru the sat nav screen (in built) via ipod. Only problem is, i have no idea how. I also have the mk4 dvd nav computer

could ne1 advise me on the cheapest way of doing this?

thanks