Ahhhhh, my bad. I misunderstood davdud101's original post. The key word was "image," as in background image. Sorry for confusing the issue. In this case, I would instead do as 3D Joe Wiltshire suggested: apply a texture to a much larger, perhaps curved object, which then serves as the background.
On the other hand, you can only render from one camera at a time, you could actually create two null objects located at the two different camera locations. Then, parent the camera to the first null object to render the frames for position #1, followed by parenting the camera to the second null object to render the frames for position #2...
There's always some way around a problem!