OnResize Skewing My Image

[tomyknoker]

I have the following and have managed to be able to use onResize to resize just my mc 'mcl', it currently fits horizontally but not vertically, so it's stretching, I want to stretch 100% on the left and right hand side but in proportion... Any ideas?

var myClip = this.createEmptyMovieClip("mcl", this.getNextHighestDepth());
var myLoader = new MovieClipLoader();
var myListener = new Object();
var myTest = random(6) + ".jpg";

Stage.align = "TL"; // Position the movie at top, center
Stage.scaleMode = "noScale"; // Prevent scaling (required!)

myListener.onResize = function (e:Object):Void {
	var sw:Number = Stage.width;
	var sh:Number = Stage.height;
	mcl._width = sw;
  	trace("New width: " + Stage.width);
};

myListener.onLoadInit = function (mcl) {
trace("load init");
mcl._alpha=0;
mcl.onEnterFrame=function(){
mcl._alpha +=15;
 
if(mcl._alpha >=100){
delete mcl.onEnterFrame;
}
}
};

Stage.addListener(myListener);
myLoader.addListener(myListener);
myLoader.loadClip(myTest,myClip);