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";
     anchor.onclick = function(){
	   window.open(this.href,'externalsite','');
	   return false;
	 };
   }
 } 
} 
window.onload = externalLinks;