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 nofollow")  
     anchor.target = "_blank";  
 }  
 
}  
window.onload = externalLinks;

$(document).ready(function(){
        $("a[@href^='http']").attr('target','_blank');
});