function externalLinks()
 { 
    domDoc = document;
    docElem = domDoc.documentElement;
    links = docElem.getElementsByTagName("a");
    for (var i=0; i<links.length; i++)
     {
         var link = links[i]; 
         if (link.getAttribute("href") && link.getAttribute("rel") == "external")
         link.target = "_blank";
         
     }
  }