function getElementsByClassName(classname, node) {
  var node = node || document;
  var a = [];
  var re = new RegExp('\\b' + classname + '\\b');
  var els = node.getElementsByTagName('*');
  for (var i = 0, len = els.length; i < len; i++) {
    if (re.test(els[i].className)) {
      a.push(els[i]);
    }
  }
  return a;
}

document.getElementsByTagName('html')[0].className = 'full-functionality';

function externalLinks() {
 if (!document.getElementsByTagName) return;
 var anchors = document.getElementsByTagName("a");
 for (var i=0; i<anchors.length; i++) {
   var anchor = anchors[i];
   if (anchor.getAttribute("href") &&
       anchor.getAttribute("rel") == "nofollow")
     anchor.target = "_blank";
 }
}
window.onload = externalLinks;