How to make a infinite SMOOTH scrolling background?

Question

This is what I have done:
var BGround1:Background=new Background();
var BGround2:Background= Background();
stage.addChild(BGround1);
stage.addChild(BGround2);
addEventListener(Event.ENTER_FRAME, moveScroll, false, 0, true);
function moveScroll(e:Event): void
                              BGround1.x -= scrollSpeed; 
                               BGround2.x -= scrollSpeed; 
                        if(BGround1.x <= -BGround1.width)
                            BGround1.x =BGround2.x + BGround2.width;
                              else if(BGround2.x <= -BGround2.width)
                            BGround2.x = BGround1.x + BGround1.width;
However, If I set scrollSpeed too high, the movement is not smooth. Is there any way to make a smooth animation?
Thanks in advance.
PS: I dont know how to put the code into code tag.

Answer 1

you can increase the framerate or decrease the scrollSpeed.  that's it.
but you'll achieve better performance by enabling the cacheAsBitmap property of BGround1 and BGround2:
var BGround1:Background=new Background();
var BGround2:Background= Background();
BGround1.cacheAsBitmap=true;
BGround2.cacheAsBitmap=true;
stage.addChild(BGround1);
stage.addChild(BGround2);
addEventListener(Event.ENTER_FRAME, moveScroll, false, 0, true);
function moveScroll(e:Event): void
                              BGround1.x -= scrollSpeed; 
                               BGround2.x -= scrollSpeed; 
                        if(BGround1.x <= -BGround1.width)
                            BGround1.x =BGround2.x + BGround2.width;
                              else if(BGround2.x <= -BGround2.width)
                            BGround2.x = BGround1.x + BGround1.width;