Having problem aligning images in slideshow

Question

Thw slide show can be viewed here http://www.jimslounge.com/slideshow/bio.swf
The images are added to a background MovieClip they are set to align in the center both horizontal and vertical.  They usually do but often they are a little off and sometimes they are way off.  Pics are added tha a Sprite called holder then holder is added to the background MovieClip holderBG the problem occures in the displaySlide function.  I've noticed the alignment problem seems to go away when I create a new instance of holder there but when I do that the memory usage steadly climes higher with each new slide.
         import com.greensock.*;
         import com.greensock.easing.*;
        import flash.display.*;
        import flash.utils.*;
        import flash.events.*;
        import flash.net.*;
        var myFont:Font2 = new Font2();
        var externalReq:URLRequest = new URLRequest("bio.txt");
        var externalLoad:URLLoader = new URLLoader();
        var myFormat:TextFormat = new TextFormat();
        var bars:Bars = new Bars();
        var n:int = 0;
        var intCurrentSlide:int;
        var req:URLRequest;
        var holder:Sprite = new Sprite();
        var holderBG:HolderBG = new HolderBG();
        var loader:Loader;
        var rand:int;
        var nxtNum:int;
        var picNum:String;
        var slideCount:int;
        var xmlLoader:URLLoader;   // slideshow xml loader
        var xmlSlideshow:XML;  // slideshow xml
        var strXMLPath:String = "bioPics-data.xml";
        var slideName:String;
//        var history:Array = new Array();
         var duration:Number=.5;
        var prevSlide:String;
        var timeline:TimelineMax;
        addChild(holderBG);
        holderBG.x = stage.stageWidth / 2 - holderBG.width / 2;
        xmlLoader = new URLLoader();  
        xmlLoader.addEventListener(Event.COMPLETE, onXMLLoadComplete);
        xmlLoader.load(new URLRequest(strXMLPath));
///////////// text setup ////////////////////                                           
        myFormat.font = myFont.fontName;
        myFormat.size = 14;
        myFormat.leading = 2.5;
        bioText.setStyle("textFormat", myFormat);
        bioText.setStyle("embedFonts", true);
        bioText.textField.alpha=1;
        externalLoad.load(externalReq);
        externalLoad.addEventListener(Event.COMPLETE, textReady);
/////////////text setup////////////////////////           
            createTimeline();
        function textReady(event:Event):void {
            bioText.htmlText = event.target.data;
        function onXMLLoadComplete(e:Event):void {
             xmlLoader.removeEventListener(Event.COMPLETE, onXMLLoadComplete);
             xmlSlideshow = new XML(e.target.data);     // create new xml with the received data
             slideCount = xmlSlideshow..image.length();   // get total slide count
            loadSlide();
         function loadSlide():void {
//            prevSlide=history[history.length-1];
            rand = Math.ceil(Math.random()* slideCount - 1); 
             loader = new Loader();
            req = new URLRequest(xmlSlideshow..@src[rand]);
             loader.contentLoaderInfo.addEventListener(Event.COMPLETE, displaySlide);
             loader.load(req);
            slideName = xmlSlideshow..@src[rand].toString();
        function createTimeline():void {
        timeline =new TimelineMax({repeat:1,repeatDelay:5,yoyo:true,onComplete:loadSlide, paused:true});
        for (var count:int = 1; count <=10; count++) {
            var mc:MovieClip=bars["bar"+count];
            timeline.append(TweenMax.from(mc, duration, {x:"64", alpha:0, ease:Cubic.easeOut}), -.4);
        function displaySlide(e:Event = null):void {
            loader.contentLoaderInfo.removeEventListener(Event.COMPLETE, displaySlide);
//           holder = new Holder();  if I do this lose the alignment problem but gain a menory problem.
            if(holder.numChildren > 0){holder.removeChildAt(0);}
            holder.addChild(loader.content);
           // center the pic
            holder.x=holderBG.width/2 - holder.width/2;
            holder.y=holderBG.height/2 - holder.height/2;
            // make the mask position over the pic
            bars.x=holder.x;
            bars.y=holder.y;
            bars.cacheAsBitmap=true;
            holder.cacheAsBitmap=true;
            holder.mask=bars;
            bars.width = holder.width;
            bars.height = holder.height;
            holderBG.addChild(holder);
            holderBG.addChild(bars);
            timeline.restart();

Answer 1

Aha... I haven't had my coffee either
. That did it
if (holderBG.holder)
            holderBG.removeChild(holder);
            holderBG.holder = null;
It isn't perfect it sitll wonders around slightly like a drunk weaving on the road but only slightly he's only had a couple of beers and isn't likely to get pulled over which is an improvement.  I'll go with it.   Thanks!