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;
	}
}

addEvent (window,'load',provideMessage,false);

function provideMessage () {
	var list = $('linkList');
	
	var li = document.createElement('li');
	var msg = document.createTextNode('Deze links openen in een nieuw venster');
	
	li.appendChild(msg);
	
	list.insertBefore (li,list.firstChild);
}