function popup(url) {
    window.open(url,'_blank','left=0,top=0,location=no,menubar=no,scrollbars=yes,status=no,toolbar=no,resizable=yes');
  }

  function setActiveStyleSheet(title) {
    var i, a, main;
    for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
      if (a.getAttribute("rel").indexOf("style") != -1 &&
          a.getAttribute("title")) {
        a.disabled = true;
        if(a.getAttribute("title") == title) a.disabled = false;
      }
    }
  }