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;