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")
			if (anchor.addEventListener)
				anchor.addEventListener("click", newWindow, false);
			else if (window.attachEvent)
				anchor.attachEvent("onclick", newWindow);
			else
				anchor.onclick = newWindow;
		}
}

function newWindow(e) {
	if (!e) var e = window.event;
	var a = e.target ? e.target : e.srcElement;
	var newwin = window.open(a.href);
	if (newwin && e.preventDefault) e.preventDefault();
	return !newwin;
}

if (window.addEventListener)
	window.addEventListener("load", externalLinks, false);
else if (window.attachEvent)
	window.attachEvent("onload", externalLinks);
else
    window.onload = externalLinks;