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;