Try the following to see if it animates, if i remember the Tween class, this should move it horizontally:

var homeTween:Tween = new Tween(home_mc, "x",Strong.easeOut, 0, home_mc.x+home_mc.width,1,true);

If it does work, then you would then use "homeTween.continueTo(230);" to move the background image to the desired x position.