Ok risolto, forse un po arzigogolato ma

codice:
// associato al Main BOX
MovieClip.prototype.zoom=function(){
	this.onPress=function(){
		zoom_foto=path+substring(this.nome_pic,6,15);
			getUrl(zoom_foto,"_blank")
		
	}
}
	
//associato al MAIn BOX.TEMP	
MovieClip.prototype.foto=function(){
    clearInterval(idPreload);
	trace(this._parent._name)
	numero=substring(this._parent._name,4,1)
	this._parent.nome_pic=eval("foto"+numero);
	this.loadMovie(path+this._parent.nome_pic)
	clearInterval(idPreload);
	idPreload = setInterval(preload,100);
	this._visible=0
	function preload(){
		car = this.getBytesLoaded();
		tot = this.getBytesTotal();
		if(car > 1024 && car == tot){
			this._visible=1;
			this.zoom()
			clearInterval(idPreload);
		}
	}
	// zoom
}

path="../pic/"
foto1="mini_id_hotel_01.jpg"
foto2="mini_id_hotel_02.jpg"
foto3="mini_id_hotel_03.jpg"

box1.temp.foto();box1.zoom()
box2.temp.foto();box2.zoom()
box3.temp.foto();box3.zoom()

Ciao