var external_links;

external_links = function () {
	var anchor,
		anchors,
		i;
		
	if (!document.getElementsByTagName) {
		return;
	}
	anchors = document.getElementsByTagName("a");
	for (i = anchors.length - 1; i >= 0; i -= 1) {
		anchor = anchors[i];
		if (anchor.getAttribute("href") && anchor.getAttribute("rel") === "external") {
			anchor.target = "_blank";
		}
	}
};

window.onload = external_links;