// Open in a new window?
  var links = document.getElementsByTagName("a");
  for (var i = 0; i < links.length; i++) {
    var link = links[i];
    if (link.className == "link_external") {
      link.onclick = clickHandler;
    }
  }

  function clickHandler() {
    if (confirm("This link is to an external website. Click OK to open this site in a new window.")) {
      open(this.href);
      return false;
    }
  }