Best way to swap background images?

[RGould8 at aol.com]

I've got a Revolution app with a background bitmap - - - let's call it 
background #1.   It's a background bitmap image that's been saved to a 
"group" and then that group has been pasted to all the other cards in the 
stack.   Let's say that group is called "background group"

What I need to do is figure out how to "swap" that background image with 
another image (background #2) of the same size, dynamically, via Transcript, 
so that once I make the swap it is now the default background image 
throughout the whole application.   Can someone steer me to the best way to 
accomplish this?
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