How to convert this (XML image gallery) from AS2 to AS3?

programming flash
1

Hi all,
I found this great tutorial here in kirupa how to create image gallery using XML http://www.kirupa.com/developer/mx2004/xml_flash_photogallery.htm
How to do the same just with AS3?
I already have my XML loaded, I just don’t know how to load images in sequence from XML using previous and next buttons
my XML:

<?xml version="1.0" encoding="UTF-8"?>

<gallery>
 
    <image>
        <title>Head full of Sand</title>
        <url>images/float_head.jpg</url>
    </image>
    
    <image>
        <title>Neck Cramp</title>
        <url>images/neck_cramp.jpg</url>
    </image>
    
    <image>
        <title>This is Cool</title>
        <url>images/gaine.jpg</url>
    </image>
    
</gallery>

and AS (galleryData is XML):

var loader:Loader = new Loader();
var preloader:MovieClip = new Pro();

preloader.x = stage.stageWidth/2;
preloader.y = stage.stageHeight/2;

loader.contentLoaderInfo.addEventListener(Event.COMPLETE, loadComplete);
loader.contentLoaderInfo.addEventListener(ProgressEvent.PROGRESS, onProgress);

next_btn.buttonMode = prev_btn.buttonMode =true;

next_btn.addEventListener(MouseEvent.CLICK, onClick);
prev_btn.addEventListener(MouseEvent.CLICK, onClick);

var file_path:String = galleryData.image.url.text();
var imgNum:int = galleryData.image.length();

function onClick(e:MouseEvent):void {
    switch (e.currentTarget) {
        case next_btn :
             // LOAD NEXT IMAGE
            break;

        case prev_btn :
            // LOAD PREVIOUS IMAGE
            break;
    }
}

function loadComplete(e:Event):void {
    removeChild(preloader);
    addChild(loader);
    description.text = galleryData.image[1].title.text();
}

function onProgress(e:Event):void {
    addChild(preloader);
}

I guess I need to use some kind of loop to through array of XML elements.

Thank you!