function openInNewWindow() {
  var newWindow = window.open(this.getAttribute('href'), '_blank');
  newWindow.focus();
  return false;
}

function getNewWindowLinks() {
  if (document.getElementById && document.createElement && document.appendChild) {
    var link;
    var links = document.getElementsByTagName('a');
    for (var i = 0; i < links.length; i++) {
      link = links[i];
      if (/\bexternallink\b/.exec(link.className)) {
        link.onclick = openInNewWindow;
      }
    }
  }
}