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";
	}
}

function popups() {
	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") == "popup")
			anchor.target = "_blank";
	}
}

function init() { 
	externalLinks();
	popups();
}

window.onload = init;