function page_loaded(evt) {
	var someNodeList = $('scheda').getElementsByTagName('a');
		var nodes = $A(someNodeList);

		nodes.each(function(node){
		        if(node.text=='riservato')Event.observe(node, 'click', item_clicked, false);
		});
	
	}
	
	function item_clicked(evt){
		alert('Iscriviti per accedere alle informazioni riservate!');
		Event.stop(evt); //avoid another call related to 'parent_node' itself
	}
Event.observe(window, 'load', page_loaded, false);