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") == "external")  
     anchor.target = "_blank";  
 } 
} 
window.onload = externalLinks;