function externalLinks() {
	if (!document.getElementsByTagName) return;
	var a = document.getElementsByTagName("a");
	
	for (var i = 0; i < a.length; i++) {
		if (a[i].getAttribute("rel") == "external") {
			a[i].onclick = openLink;
		}
	}
}

function openLink() {
	void (window.open(this.href, '', ''));
	return false;
}

window.onload = externalLinks;