Centered jpgs... brain freeze

This is NOT working. I need it to center every image, regardless of size… Appreciate the input…



var loader:Loader = new Loader();

addChild(loader);

loader.load( new URLRequest("http://www.huhwow.com/cgi-bin/add-watermark.cgi/data2/Sync/200802/26/amazing-pics/75503464.jpg"));

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

function itLoaded(event:Event):void 
{
	trace(stage.width)
	trace(stage.height)
	var stagewidth:Number = stage.width / 2;
	loader.width = 100;
	var loaderwidth:Number = loader.width / 2;
	trace('stage width by 2 is ' + stagewidth);
	trace('loader width is ' + loaderwidth);
	
	loader.height = 100;
	loader.x = (stagewidth - loaderwidth);
	loader.y = (stage.height - loader.height)/2;
	trace(stagewidth - loaderwidth);
	
}