Green screen composite question

Hello all,
I need to be able to put my own video on the "green screen" that this couple is watching on TV:
http://www.istockphoto.com/file_closeup.php?id=11473468
I'm a complete novice at this but I'm assuming the TV, my video, and the people watching have to be on separate layers?
(so that my video does not appear "in front' of the people's heads)
Can I do this with Final Cut Express or is there some other software app I can use?
Thanks in advance!
Mike

You video should be scaled and place on the bottom (V1).
The stockfootage clip should be above it on V2,
with the chromakey filter applied to it.
When your adjusting the key, check at the very beginning
of the clip when the woman's shadow is on the green screen.
Make sure you the green color selection includes those darker shades of green.
If you shoot the video to use in the TV by playing the footage through
a real monitor, it will probably look a bit more realistic,
since you can play with a little reflection off the glass,
and you could even block the reflection when the woman walks by.
Details make composites work.

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