function sendform(e) {
	//Event.stop(e);
	
	var formulaire = $(Event.findElement(e,'form'));
	formulaire.submit();
}

function initAgendaObserver(e) {
    
	$$('div.agenda select').each(function(select) {
		Event.observe(select, 'change', sendform);
	});        
}

Event.observe(window, 'load', initAgendaObserver);