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;