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";  
 }  
 var areas = document.getElementsByTagName("area");  
 for (var i=0; i<areas.length; i++) {  
   var area = areas[i];  
   if (area.getAttribute("href") &&  
       area.getAttribute("rel") == "external")  
     area.target = "_blank";
 }  
}  
window.onload = externalLinks;