import flash.display.*;

import flash.events.*;

import flash.net.*;

 

stage.scaleMode = StageScaleMode.NO_SCALE;

stage.align = StageAlign.TOP_LEFT;

var loader:Loader = new Loader();

loader.contentLoaderInfo.addEventListener(Event.COMPLETE, onComplete);

loader.load(new URLRequest("1.gif"));

addChild(loader);

stage.addEventListener(Event.RESIZE, update);

function onComplete(e:Event):void 

{

        e.target.removeEventListener(Event.COMPLETE, onComplete);

        (e.target.content as Bitmap).smoothing = true;

        update();

}

function update(e:Event = null):void {

        loader.scaleX = loader.scaleY = 1;

        var scale:Number=Math.min(stage.stageWidth /loader.width,stage.stageHeight/loader.height);

        loader.scaleX = loader.scaleY = scale;

        loader.x = stage.stageWidth * 0.5 - loader.width * 0.5;

        loader.y = stage.stageHeight* 0.5 - loader.height * 0.5;

}