window.addEvent('domready', function() {
	$('contact_form').addEvent('submit', function(e){
		valid = true;
		$('contact_form').getElements('.required').each(function(el){
			text = $(el).get('value').trim();
			if(text == '') {
				$(el).set('class', 'required not-valid');
				valid = false;
			} else {
				$(el).set('class', 'required');
			}
		});
		
		if (!valid) {alert("Per cortesia compilare i campi evidenziati.");e.stop();};

	});
});