Вопрос AS 3.0 XML MP3-плеер для вашего сайта

package
{
    import flash.display.Sprite;
    import flash.net.URLRequest;
    import flash.net.URLLoader;
    import flash.events.Event;
    import flash.media.Sound;
    import flash.media.SoundChannel;
    import flash.events.MouseEvent;
    import flash.display.Loader;

    import gs.TweenMax;
    import gs.easing.*;

    public class main extends Sprite
    {
        private var sound:Sound = new Sound();
        private var sc:SoundChannel = new SoundChannel();
        private var currentSound:Sound = sound;
        private var currentIndex:Number = 0;

        private var xml:XML;
        private var musicList:XMLList = new XMLList();
        private var musicReq:URLRequest;
        private var imgReq:URLRequest;
        private var isPlaying:Boolean = true;

        private var loader:Loader = new Loader();

        private var pos:Number

        public function main():void
        {//construnctor
            super();

            loadXML("main.xml");
            settings();
            option();
        }

        protected function loadXML(nameXML:String):void
        {
            var URLReq:URLRequest = new URLRequest(nameXML);
            var URLLoad:URLLoader = new URLLoader(URLReq);

            URLLoad.addEventListener(Event.COMPLETE, whenLoaded)
        }

        protected function whenLoaded(e:Event):void
        {
            xml = new XML(e.target.data);
            musicList = xml.song;
            musicReq = new URLRequest(musicList[0].url);
            sound.load(musicReq);
            sc = sound.play();
            isPlaying = true;

            imgReq = new URLRequest(musicList[0].img);
            loader.load(imgReq);
            album.addChild(loader);
            loader.x = 0
            loader.y = 0;
            loader.alpha = 0;
            loader.scaleX = loader.scaleY = .485;
            TweenMax.to(loader ,4,{autoAlpha:1});

        }

        protected function settings():void
        {
            with(pause_btn)
            {
                addEventListener(MouseEvent.CLICK, pauseMusic);
            }

            with(next_btn)
            {
                addEventListener(MouseEvent.CLICK, nextMusic);
            }

            with(prev_btn)
            {
                addEventListener(MouseEvent.CLICK, prevMusic);
            }
        }

        protected function pauseMusic(e:MouseEvent):void
        {
            pos = sc.position;
            sc.stop();
            isPlaying = false;
        }

        protected function nextMusic(e:MouseEvent):void
        {
            trace("next");

            if (currentIndex  0)
            {
                currentIndex--;
            }
            else
            {
                currentIndex = musicList.length() - 1;
            }

            var nextReq:URLRequest = new URLRequest(musicList[currentIndex].url);
            var prevSong:Sound = new Sound(nextReq);

            sc.stop();
            sc = prevSong.play();
            isPlaying = true;
            currentSound = prevSong;

            sc.addEventListener(Event.SOUND_COMPLETE, nextMusic);

            var nextImg:URLRequest = new URLRequest(musicList[currentIndex].img);
            loader.load(nextImg);
            album.addChild(loader);
            loader.x = 0
            loader.y = 0;
            loader.alpha = 0;
            loader.scaleX = loader.scaleY = .485;
            TweenMax.to(loader ,4,{autoAlpha:1});
        }

        protected function option():void
        {
            pause_btn.buttonMode = true;
            next_btn.buttonMode = true;
            prev_btn.buttonMode = true;
        }
    }
}