Come faccio a fargli pescare nella cartella delle immagini in maniera casuale ? Usando la funzione random applicata alla variabile index3 ? qualcuno può suggerirmi il metodo ? Non credo sia difficile

stop();


var slideShow3:Function = function (target:MovieClip, shifting:Number) {
var mclo3:MovieClipLoader = new MovieClipLoader();
var mcli3:Object = new Object();
var index3:Number = 1;
mcli3.onLoadProgress = function(target:MovieClip, lbytes:Number, tbytes:Number) {
trace("Caricamento..."+Math.floor((lbytes/tbytes)*100)+"%");
};
mcli3.onLoadError = function(target:MovieClip, errorCode:String) {
if (errorCode == "URLNotFound") {
slideShow3(target, shifting);
}
};
mcli3.onLoadInit = function(target:MovieClip):Void {
index3++;
var t:Object = new mx.transitions.Tween(target, "_alpha", mx.transitions.easing.None.easeNone, 0, 100, .5, true);
t.onMotionFinished = function() {
var a = setInterval(function () {
clearInterval(a);
var t:Object = new mx.transitions.Tween(target, "_alpha", mx.transitions.easing.None.easeNone, 100, 0, .5, true);
t.onMotionFinished = function() {
mclo3.loadClip("backshd/"+"hd"+index3+".jpg", target);
};
}, shifting*5000);
};
};
mclo3.addListener(mcli3);
mclo3.loadClip("backshd/"+"hd"+index3+".jpg", target);
};
//crea il movieclip per lo slideshow
var test:MovieClip = this.mcBack3.createEmptyMovieClip("test3", 1);
slideShow3(test, 5);