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') && hasValue(anchor.rel, 'external')) {
                          anchor.target = '_blank';
                          addClass(anchor,'external');
                  }
          }
  }