//unobtrusive JavaScript, per le popup
// elementi con class="popup"
function popUp(winURL) {
  window.open(winURL,"popup","toolbar=0,menubar=0,scrollbars=0,resizable=0,height=470,width=410");
}

window.onload = credits;
function credits() {
  var links = document.getElementsByTagName("a");
  for (var i=0; i<links.length; i++) {
    if (links[i].getAttribute("class") == "popup") {
      links[i].onclick = function() {
        popUp(this.getAttribute("href"));
        return false;
      }
    }
  }
}