// JavaScript Document
function popupwin() {
  var stile = "status=no, menubar=no, toolbar=no scrollbar=no";
  var oUrl="http://www.cittadelbio.it/popups/popup.htm";
   var w = 300;
   var h = 300;
   var l = Math.floor((screen.width-w)/2);
   var t = Math.floor((screen.height-h)/2);
      window.open(oUrl,"","width=" + w + ",height=" + h + ",top=" + t + ",left=" + l + " " +stile);
 }