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;