// Christopher Robinson - www.edg3.co.uk
function addEvent(elm, evType, fn, useCapture) {
	if(elm.addEventListener) {
		elm.addEventListener(evType, fn, useCapture);
		return true;
	} else if(elm.attachEvent) {
		var r = elm.attachEvent("on"+evType, fn);
		return r;
	}
}
function externalLinks() {
	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.setAttribute("target", "_blank");
		}
	}
}
addEvent(window, "load", externalLinks);