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;