document.onclick = function(e){
	var target = e ? e.target : window.event.srcElement;
	while (target && !/^(a|body)$/i.test(target.nodeName)){
		target = target.parentNode;
	}
	if (target && target.getAttribute('rel') && target.rel == 'external'){
		var external = window.open(target.href);
		return external.closed;
	}
}