class CustomLoader extends Loader

 private var _urls:Array = [];

 private var _count:int = 0;

 private var _content:Array = [];

 public function addUrl ( url:String ) : void {

 

   var req:URLRequest = new URLRequest ( url )

 

   _urls.push ( req );

 }

 public function load():void {

 

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

    this.load ( _urls [0] );

 }

 

 private function onComplete(e:Event):void {

 

      if( _count == _urls.length)  dispatchEvent ( new CustomLoaderEvent(CustomLoaderEvent.COMPLETE , _content ) ;

      else _count++ , _content.push ( e.currentTarget.content) , this.load ( _urls [_count] );

 }