[amexdesign]

попробуй так:

var total:Number;
var thumbnails:Array = new Array();
galleryXML.onLoad = function(success) {
	if (success) {
		total = this.firstChild.childNodes[1].childNodes.length;
		for (var i:Number = 0; i < total; i++) {
			thumbnails[i] = this.firstChild.childNodes[1].childNodes[i].attributes.thumbnail;
		}
                loadThumbs();
	}
}
 
function loadThumbs(){
	for (var i:Number = 0; i < total; i++) {
		var preview_mc:MovieClip = thumbnails_mc.attachMovie("box", "box"+i, i);
		preview_mc.ID = i;
		var mclListener:Object = new Object();
    	        mclListener.onLoadStart = function (target:MovieClip){
    	        };
    	        mclListener.onLoadProgress = function (target:MovieClip, bytesLoaded:Number,bytesTotal:Number):Void {
        	        percent = Math.round(bytesLoaded/bytesTotal*100);
			preview_mc.preloader_txt.text = percent;
		};
    	        mclListener.onLoadComplete = function (target:MovieClip){
		};
    	        mclListener.onLoadInit = function (target:MovieClip){
		};
    	        var image_mcl:MovieClipLoader = new MovieClipLoader();
    	        image_mcl.addListener(mclListener);
    	        image_mcl.loadClip(thumbnails[i], preview_mc.target_mc);
	}
}