Scrolling dynamic XML Gallery - AS3

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var xmlLoader:URLLoader = new URLLoader();
var xmlData:XML = new XML();
xmlLoader.addEventListener(Event.COMPLETE, LoadXML);

var xmlPath:String = "image-scroller.xml";
xmlLoader.load(new URLRequest(xmlPath));
trace("loading xml from: " + xmlPath);

function LoadXML(e:Event):void {
trace("xml loading complete");
xmlData = new XML(e.target.data);
trace(xmlData.image);
buildScroller(xmlData.image);
}


var scroller:MovieClip = new MovieClip();
scroller.y = 40;
scroller.x = padding;
var speed:Number;
var padding:Number = 25;
var thumbFadeOut:Number = .2;
var thumbFadeIn:Number = 1;
var thumbSmall:Number = 1;
var thumbLarge:Number = 1.075;
this.addChild(scroller);
trace("Scroller");

function buildScroller(imageList:XMLList):void{
trace("build Scroller");
for (var item:uint = 0; item < imageList.length(); item++ ) {
var thisOne:MovieClip = new MovieClip();

var blackBox:Sprite = new Sprite();
blackBox.graphics.beginFill(0x000000);
blackBox.graphics.drawRect( 45, 0, 50, 50);
blackBox.alpha = thumbFadeOut;
thisOne.addChild(blackBox);
thisOne.blackBox = blackBox;

thisOne.x = thisOne.myx = (50 + padding) * item;
thisOne.y = 400;
thisOne.itemNum = item;
thisOne.title = imageList[item].attribute("title");
thisOne.link = imageList[item].attribute("url");
thisOne.src = imageList[item].attribute("src");

var thisThumb:Sprite = new Sprite();
var ldr:Loader = new Loader();
var urlReq:URLRequest = new URLRequest(thisOne.src);
trace("loading thumbnail "+item+" into Scroller: " + thisOne.src);
ldr.load(urlReq);
ldr.contentLoaderInfo.addEventListener(Event.COMPL ETE, completeHandler);
ldr.contentLoaderInfo.addEventListener(IOErrorEven t.IO_ERROR, errorHandler);
thisThumb.addChild(ldr);
thisOne.addChild(thisThumb);
thisOne.buttonMode = true;
thisOne.addEventListener(MouseEvent.MOUSE_OVER, overScrollerItem);
thisOne.addEventListener(MouseEvent.MOUSE_OUT, outScrollerItem);
thisOne.addEventListener(MouseEvent.CLICK, clickScrollerItem);

scroller.addChild(thisOne);
}

scroller.addEventListener(Event.ENTER_FRAME, moveScrollerThumbs);
trace("termination of build scroller");
}

function overScrollerItem(e:MouseEvent):void {
Tweener.addTween(e.currentTarget, { scaleX:thumbLarge, scaleY:thumbLarge, x:e.currentTarget.myx - e.currentTarget.width * Math.abs(thumbSmall - thumbLarge)/2,y:400,y: -e.currentTarget.width * Math.abs(thumbSmall - thumbLarge)/2, time:1 } );
Tweener.addTween(e.currentTarget.blackBox, { alpha:thumbFadeIn, time: 1 } );
}
function outScrollerItem(e:MouseEvent):void {
trace("out" + e.currentTarget.name);
Tweener.addTween(e.currentTarget, { scaleX:thumbSmall, scaleY:thumbSmall, x:e.currentTarget.myx, y:0, time:1 } );
Tweener.addTween(e.currentTarget.blackBox, { alpha:thumbFadeOut, time: 1 } );
}
function clickScrollerItem(e:MouseEvent):void {
var urlRequest:URLRequest = new URLRequest(e.currentTarget.link);
try {
navigateToURL(urlRequest);
}
catch (e:Error) {
trace(e);
}
}
function completeHandler(e:Event):void {

resizeMe(e.target.loader.parent, 140, 105, true, true, false);
Tweener.addTween(e.target.loader.parent.parent, { alpha:1, time: .5 } );
}
function errorHandler(e:IOErrorEvent):void {
trace("thumbnail error="+e);
}



function resizeMe(mcisplayObject, maxW:Number, maxH:Number=0, constrainProportions:Boolean=true, centerHor:Boolean=true, centerVert:Boolean=true):void{
maxH = maxH == 0 ? maxW : maxH;
mc.width = 50;
mc.height = 50;
if (constrainProportions) {
mc.scaleX < mc.scaleY ? mc.scaleY = mc.scaleX : mc.scaleX = mc.scaleY;
}
if (centerHor) {
mc.x = (maxW - mc.width) / 2;
}
if (centerVert){
mc.y = (maxH - mc.height) / 2;
}
}

function moveScrollerThumbs(e:Event):void {
if ( mouseY > scroller.y && mouseY < scroller.y + scroller.height) {//vertically over scroller
if (mouseX < stage.stageWidth/2 - padding*2 && mouseX > 0) {//left of stage explicitly
speed = -(mouseX - (stage.stageWidth/2 - padding*2)) / 8;
}
else if (mouseX > stage.stageWidth/2 + padding*2 && mouseX < stage.stageWidth) {//right of stage explicitly
speed = -(mouseX - (stage.stageWidth/2 + padding*2)) / 8;
}
else {
speed = 0;
}
scroller.x += speed;

//scroller limits
if (scroller.x < -scroller.width + stage.stageWidth - padding) { //if scrolled too far left
scroller.x = -scroller.width + stage.stageWidth - padding;
}
else if (scroller.x > padding) { //if scrolled to far right
scroller.x = padding;
}
}
}