function externalLinks() {

	if (!document.getElementsByTagName) return;

	var anchors = document.getElementsByTagName("a");

	for (var i=0; i<anchors.length; i++) {
		var anchor = anchors[i];
		var relvalue = anchor.getAttribute("rel");

		if (anchor.getAttribute("href")) {

			var external = /external/;
			var relvalue = anchor.getAttribute("rel");

			if (external.test(relvalue)) {

				anchor.target = "_blank";

			} // if
		} // if

	} // for

} // externalLinks()

window.onload = externalLinks;