Make pictures fade-in to eachother using UIloader

Question

I have a problem making pictures fade into each other.
I have a gallery using UIloader. the problem is that when I press the next_btn the prev pic dissapears during the upcoming loads.
I really appreciate help on this one!
cheers!
this is my code:
bcn_next_btn.addEventListener(MouseEvent.CLICK, nextImage);
import fl.transitions.Tween;
import fl.transitions.easing.*;
//variable is a container that holds som value.....
var imageNumber:Number = 1;
function checkNumber(): void{
    bcn_next_btn.visible=true;
    bcn_back_btn.visible=true;
    //it the imagenumber is = 5 then do something
    if (imageNumber==3){
        trace(imageNumber);
        bcn_next_btn.visible = false
    // if the imagenumber is = 1 then dont show the backbtn
    if(imageNumber==1){
        trace(imageNumber);
        bcn_back_btn.visible = false;
checkNumber();
function nextImage(evtObj:MouseEvent):void
    imageNumber++;
    LargeImageLoader.source = "image/emma/emma_"+imageNumber+".jpg";
    checkNumber();
bcn_back_btn.addEventListener(MouseEvent.CLICK, backImage);
function backImage(evtObj:MouseEvent):void
    imageNumber--;
    LargeImageLoader.source = "image/emma/emma_"+imageNumber+".jpg";
    checkNumber();
LargeImageLoader.addEventListener(Event.COMPLETE, ImageLoaded);
function ImageLoaded(event:Event){
    new Tween(LargeImageLoader,"alpha",Regular.easeOut,0,1,2,true);   
progressBar.source=LargeImageLoader,
progressBar.addEventListener(ProgressEvent.PROGRESS,progressHandler);
progressBar.addEventListener(Event.COMPLETE,completeHandler);
function progressHandler (event:ProgressEvent):void{
function completeHandler (event:Event):void{

Answer 1

thx for your reply!
Ait... two loaders how do I do that....?
I am pretty new to this world..
cheers!