function returnDays() {
	today = new Date();
	heure = today.getHours();
	minute = today.getMinutes();
	seconde = today.getSeconds();
	event = new Date(2009, 1, 10, heure, minute, seconde); // janvier 0 - decembre 11
	date_today = today.getTime();
	date_event = event.getTime();
	nb_jours = date_event-date_today;
	nb_jours = Math.round((Math.round(nb_jours)/1000)/60/60/24);
	return(nb_jours);
}