鼠标移动观看图片效果（swf在文件中）

package  
{
    
    import flash.display.MovieClip;
    import flash.display.Loader;
    import flash.net.URLRequest;
    import flash.events.Event;
    import flash.events.MouseEvent;
    
    
    public class KantuMain extends MovieClip 
    {
        public var loader:Loader;
        
        public function KantuMain() 
        {
            laodershijian();
            shubiaoshijian();
        }
        public function laodershijian():void
        {
            loader = new Loader();
            loader.load(new URLRequest("1.jpg"));
            loader.contentLoaderInfo.addEventListener(Event.COMPLETE,onloaderhandler);
        }
        public function onloaderhandler(e:Event):void
        {
            //loader.x=-200;
//            loader.y=-200;
            stage.addChild(loader);
        }
        public function shubiaoshijian():void
        {
            stage.addEventListener(MouseEvent.MOUSE_MOVE,onMouseMovehandler);
        }
        public function onMouseMovehandler(e:MouseEvent):void
        {
            loader.x-=((mouseX+loader.x)/20);
            loader.y-=((mouseY+loader.y)/20);
        }
        
    }
    
}

有点小bug，请高手指教……咋能不让图片露边……