var myLoader:Loader = new Loader();
myLoader.contentLoaderInfo.addEventListener(ProgressEvent.PROGRESS, onProgressStatus);
myLoader.contentLoaderInfo.addEventListener(Event.COMPLETE, onLoaderReady);
myLoaderOnClickDown.contentLoaderInfo.addEventListener(MouseEvent.MOUSE_DOWN, downClick);
var fileRequest:URLRequest = new URLRequest("myImage.jpg");
myLoader.load(fileRequest);
function downClick(event:MouseEvent):void
{
var fileRequestNew:URLRequest = new URLRequest("myImageQuality.jpg");
myLoader.load(fileRequestNew);
}