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.title = (anchor.title != "") ? anchor.title+"" : "opens in a new window";
anchor.className = (anchor.className != '') ? anchor.className+' external' : 'external';
}
}
}
window.onload = externalLinks;