Reszable masked background

programming flash
1

Hi,

I’m working on a short flash movie where I want to mask the background picture with a script. Basically I want the movie maskbg of 30x30 pix scaled to fullscreen (the whole screen).
I already tried several thing, but nothing seems to be working.

Below you can see the AS I’ve used

Stage.scaleMode = "noScale";
Stage.align = "TL";
stageResize = function () {
    background_mc._x = 0;
    background_mc._y = 0;
    background_mc._width = Stage.width;
    background_mc._height = Stage.height;
	    footer._y = Stage.height - footer._height
	    footer._x = 0
	    footer._width = Stage.width
	    maskbg._y = Stage.height / 2 - maskbg._height / 2;
    maskbg._x = Stage.width / 2 - maskbg._width / 2;
};
stageResize();
var stageListener:Object = new Object();
stageListener.onResize = function() {
	stageResize();
};
Stage.addListener(stageListener);


import mx.transitions.Tween ; 
import mx.transitions.easing.*;

var xscaleT:Tween = new Tween(maskbg, "_xscale", Strong.easeOut, 0, 100, 5, true); 
var yscaleT:Tween = new Tween(maskbg, "_yscale", Strong.easeOut, 0, 100, 5, true);

Thanks
Marvin