function zoom(n) {
  with (document) {
		getElementById('schermo').style.height = getElementById('capo').clientHeight+"px";
		getElementById('zoom').style.left = 198+(563-getElementById('zoom').width)/2+"px";
		getElementById('zoom').style.top = 190+(getElementById('prodotto').clientHeight-getElementById('zoom').height)/2+"px";
		getElementById('chiudi_zoom').style.left = 198+(563-getElementById('zoom').width)/2+getElementById('zoom').width-22+"px";
		getElementById('chiudi_zoom').style.top = 195+(getElementById('prodotto').clientHeight-getElementById('zoom').height)/2+"px";
		if (n == 1) {
	    getElementById('schermo').style.display = "block";
	    getElementById('zoom').style.visibility = "visible";
	    getElementById('chiudi_zoom').style.visibility = "visible";
		} else {
	    getElementById('schermo').style.display = "none";
	    getElementById('zoom').style.visibility = "hidden";
	    getElementById('chiudi_zoom').style.visibility = "hidden";
		}
  }
}