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