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') == 'ext')
     anchor.target = '_blank';
 }
}
// window.onload = externalLinks;