Something

var mcl:MovieClipLoader = new MovieClipLoader();
var obj:Object = new Object();
mcl.addListener(obj);



this.createEmptyMovieClip("thumbsholder", 34);
var anzahl = 5;
ladeThumb(0);



function ladeThumb(nr:Number):Void {
	
	var d = this.thumbsholder.createEmptyMovieClip("mc"+nr, nr);
	d._x = 50*nr;
	mcl.loadClip("thumbs/p"+nr+".jpg", d);
	
	obj.onLoadInit = function(target:MovieClip) {
		var m = target._parent.attachMovie("mask_mc", "mask_mc"+nr, nr+1000, {_x:d._x});
		//m.setMask(target)
		
		target.onPress = function() {
			trace(nr);
		};
		
		if (nr<anzahl) {
			ladeThumb(nr+1);
		}
		
	};
}