function externalLinks() {

  if (document.getElementsByTagName) {
 
  	var anchors = document.getElementsByTagName("a") ;
 
  	for (var i=0; i<anchors.length; i++) {
 
   	  if (anchors[i].getAttribute("href")
   	  &&  anchors[i].getAttribute("rel")
   	  &&  anchors[i].getAttribute("rel").match(("external"))) {
    
     	anchors[i].target = "_blank" ;
      }
    }
  }
}

//window.onload = externalLinks ;