Tweenlite: slideshow not "sliding"

Hello,

I've got a little problem with a slideshow I am modifying. Note that I am not the maker of it, but am adding stuff to the actual flash. I haven't changed it much but it won't "slide" anymore and I can't find why...

Here's the code:

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import com.greensock.*;
import flash.net.URLRequest;
import flash.display.Stage;

var imageLoader:Loader = new Loader();
var imageLoader2:Loader = new Loader();
var myTween:TweenLite;
var myImages_array:Array = new Array;

var img = 0;
var ordre = 0;
var image_total = 0;

var transition = 0;
var musique = 0;
var duree = 0;
var site_root = "";

function load_xml():void
{                   
    var rnd = Math.floor(Math.random()*100000000);
    var url:String = root.loaderInfo.parameters.site_root + "services/slideshow.ashx?id=" + root.loaderInfo.parameters.sujet_no + "&rn=" + rnd;
    var loadit:URLLoader = new URLLoader();
    loadit.addEventListener(Event.COMPLETE, completeHandler);
    loadit.load(new URLRequest(url));
   
    function completeHandler(e:Event):void {
        var myXML:XML = new XML(e.target.data);
        var myOptions:XMLList = myXML.options.elements();
        var myImages:XMLList = myXML.images.elements();
       
        transition = myOptions[0].@["id"];
        musique = myOptions[1].@["id"];
        duree = myOptions[2].@["id"]; // in seconds
       
        for each(var image:XML in myImages)
        {
            myImages_array.push(image.@["path"]);
        }
       
        init_slideshow();
    }
}

function init_slideshow()
{
    image_total = myImages_array.length;
   
    load_image(imageLoader,img);
    load_image(imageLoader2,img+1);
    img = img + 1;
    animate_slideshow();
}

function animate_slideshow()
{
  if(ordre == 0)
  {
      myTween = new TweenLite(myLoader, 2, {alpha:0,delay:duree, onComplete:next_slide});
  }
  else
  {
      myTween = new TweenLite(myLoader2, 2, {alpha:0,delay:duree, onComplete:next_slide});
  }
}

function next_slide()
{
    if(img >= image_total-1)
    {
        img = -1;
    }
   
    if(ordre == 0)
    {
        setChildIndex(myLoader,0);
        setChildIndex(myLoader2,1);
       
        myLoader.alpha = 1;
        load_image(imageLoader,img+1);
        img = img + 1;

        ordre = 1;
    }
    else
    {
        setChildIndex(myLoader,1);
        setChildIndex(myLoader2,0);
       
        myLoader2.alpha = 1;
        load_image(imageLoader2,img+1);
        img = img + 1;

        ordre = 0;
    }

    animate_slideshow();
}

function load_image(myMc,img)
{
    myMc.unload();

    if(ordre == 0)
    {
        for(var i:uint = 0; i < myLoader.numChildren; i++){
           myLoader.removeChildAt(i);
        }
    }
    else
    {
        for(var z:uint = 0; z < myLoader2.numChildren; z++){
              myLoader2.removeChildAt(z);
        }
    }
   
    myMc.load(new URLRequest(root.loaderInfo.parameters.site_root + myImages_array[img]));
}

function hide_image()
{
    if(img == myImages_array.length - 1)
    {
        img = 0;
    }
    else
    {
        img = img + 1;
    }
   
    myTween = new TweenLite(myLoader, 5, {alpha:0,delay:duree, onComplete:load_image, onCompleteParams:[img]});
}

imageLoader.contentLoaderInfo.addEventListener(Event.COMPLETE, function(e:Event){
  myLoader.addChild(e.target.content);
});

imageLoader2.contentLoaderInfo.addEventListener(Event.COMPLETE, function(e:Event){
  myLoader2.addChild(e.target.content);
});

myLoader.x = 0;
myLoader.y = 0;

myLoader2.x = 0;
myLoader2.y = 0;

load_xml();

stop();

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So, from the XML, everything is loaded fine (I traced it) and I have all values. The slideshow starts (the first image appear) but it won't slide to the second one (or so on)... I guess there is a problem with the Tweenlite, but what?

Thanks for any help!