I'm not sure what you mean, but I think you're trying to ask "How do I get the battleback to scroll," like the way you scroll a webpage. You just change the x and y of the sprite (assuming you loaded the full bitmap or whatever you needed to do) by whatever increment you need. Some of the classes (can't remember which, I think it's just Bitmap) also have @ox and @oy, but I haven't really used those so I don't know if they'd help.
Alternatively, just look at how Fogs are implemented in the RTP.