// JavaScript Document
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;