function website(url){
	popupWindow = window.open(url, '_blank','');
	popupWindow.focus();
}

var external = function(){
	var anchors = $$("a");
	anchors.each(function(anchor, i) {
		var relAttribute = String(anchor.getAttribute('rel'));
		
		if (anchor.getAttribute('href') && (relAttribute=='external')){
			
			anchor.onclick = function() {
				website(this);
				return false;
			};
		}
	});
};

window.addEvent('domready', function(){
	new external();
});