mp3 player help ><

programming flash
1

i am making a simple mp3 player using a list component. ive tried everything to do what im trying to do: im trying to make it so that when i load a new song all of the variables for the last song are reset. that tasks seems impossible. ive tried EVERYTHING, or that is what i think. any help would be greatly appreciated :D. below is my AS code. i would upload my file, but its too big. link to file

var artistList:mx.controls.List;
var sound:Sound = new Sound();
info_txt.autoSize = true;
import mx.styles.CSSStyleDeclaration;
var new_style:Object = new CSSStyleDeclaration();
new_style.setStyle("fontFamily", "_sans");
new_style.setStyle("fontSize", 10);
new_style.setStyle("fontWeight", "normal");
new_style.setStyle("textDecoration", "none");
new_style.setStyle("color", 0xffffff);
new_style.setStyle("borderStyle", "solid");
new_style.setStyle("borderColor", "0x666666");
new_style.setStyle("backgroundColor", "0x000000");
new_style.setStyle("selectionDuration", 0);
new_style.setStyle("textRollOverColor", "0xff3399");
new_style.setStyle("textSelectedColor", "0x666666");
new_style.setStyle("themeColor", "0x111111");
_global.styles.myStyle = new_style;
artistList.setStyle("styleName", "myStyle");
songList.setStyle("styleName","myStyle");
var artistXML:XML = new XML();
var artists:Array = new Array();
var xmlSource = "playlist.xml";
artistXML.ignoreWhite = true;
artistXML.load(xmlSource);
artistXML.onLoad = function(success) {
    if (success) {
        artistNode = artistXML.firstChild.childNodes;
        for (i=0; i<artistNode.length; i++) {
            artistList.addItem(artistNode*.attributes.name);
        }
    }
    artistIndex = -1;
    updatesongList(artistIndex);
};
var listener:Object = new Object();
listener.change = function(e:Object) {
    if (e.target._name == "artistList") {
        songList.removeAll();
        artistIndex = e.target.selectedIndex;
        updatesongList(artistIndex);
    } else if (e.target._name == "songList") {
        sound.stop();
        songIndex = e.target.selectedIndex;
        prepare(songIndex, artistIndex);
    }
};
artistList.addEventListener("change", listener);
songList.addEventListener("change", listener);
updatesongList = function (artistIndex) {
    songsNode = artistNode[artistIndex].childNodes;
    for (i=0; i<songsNode.length; i++) {
        songList.addItem({label:songsNode*.attributes.name, data:songsNode*.attributes.url});
    }
};
prepare = function (songIndex, artistIndex) {
    clearInterval(clock)
    info_txt.text = artistNode[artistIndex].attributes.name+" - "+songsNode[songIndex].attributes.name
    sound.loadSound(songsNode[songIndex].attributes.url, true);
    clock = setInterval(timeInfo, 75);
};
sound.onLoad = function(){
    songLength = this.duration
}
timeInfo = function(){
    var totalSeconds:Number = sound.position/1000;
    var percentPlayed:Number = sound.position / songLength;
    var minutes:Number = Math.floor(totalSeconds/60);
    var seconds = Math.floor(totalSeconds)%60;
    if (seconds<10) {
      seconds = "0"+seconds;
   }
   positionbar_mc._width = percentPlayed * 300;
   timeinfo_txt.text = minutes + ":" + seconds;
}