function Popup(finestra,w,h) {
	var l = screen.width;
   	l = (l-w)/2;
   var t =  screen.height;
	t=(t-h)/2;
      window.open(finestra,'','width='+w+', height='+h+', top='+t+', left='+l+', toolbar=no, scrollbars=yes');
 }