function externalLinks() {  if
     (!document.getElementsByTagName) return;  var anchors =
     document.getElementsByTagName("a");
      for (var i=0; i<anchors.length; i++) {
        var anchor = anchors[i];
      var relvalue = anchor.getAttribute("rel");

        if (anchor.getAttribute("href")) {
       var external = /external/;
       var relvalue = anchor.getAttribute("rel");
       if (external.test(relvalue))  { anchor.target = "_blank"; }
        }
      }
     }
     window.onload = externalLinks;