function popupWindow(url,width,height) {
	var fromleft = (screen.width / 2) - (width / 2);
	var fromtop = (screen.height / 2) - (height / 2);
	winstr="toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=1,resizable=1,left=100,top=100,width="+width+",height="+height+",screenY="+fromtop+",screenX="+fromleft+",top="+fromtop+",left="+fromleft;
	finestra=window.open(url,"popupWindow",winstr);
}