AS3 一个loader加载多张图片

var i:int = 0;
var picAry:Array = ["1.jpg","2.jpg","3.jpg","4.jpg"];
var emb:Loader;
var loader:Loader = new Loader  ;
loader.load(new URLRequest("1.jpg"));
loader.contentLoaderInfo.addEventListener(Event.COMPLETE,showPic);
function showPic(e:Event):void
{
        emb = loader;
        addChild(emb);


        emb.addEventListener(MouseEvent.CLICK, onTextClick);
}


function onTextClick(e:MouseEvent):void
{
        i++;
        if (i>picAry.length-1)
        {
                i = 0;
        }
        emb.load(new URLRequest(picAry[i]));
}