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";
 }
}
function addLoadEvent(func){var oldonload = window.onload;if (typeof window.onload != 'function'){window.onload = func;}
else {window.onload = function(){if(oldonload){oldonload();}func();}}}
addLoadEvent(function(){externalLinks();});