What code would I use to change the focus of an object so it would rotate around the center of the screen like for a car game with a scrolling bground that moved based on key presses?
Ah, well if you want the background to loop all the way back around, so you could do donuts, you should start with the infinite menu tutorial.
http://www.kirupa.com/developer/mx/infinite.htm
Then just switch out the menu for your background.