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;