var url:String = "http://www.ipentec.com/products-banner/lcx.png";
var urlReq:URLRequest=new URLRequest(url);
var ld:Loader = new Loader();
ld.contentLoaderInfo.addEventListener(Event.COMPLETE, onComplete);
ld.load(urlReq);
function onComplete(eventObj:Event):void{
trace("Complete");
var pw:int = ld.content.width;
var ph:int = ld.content.height;
trace(pw+","+ph);
}