datedujour = new Date();
hdj=datedujour.getHours();
mdj=datedujour.getMinutes();
sdj=datedujour.getSeconds();
date_even = new Date(2009, 09, 22, hdj, mdj, sdj); //janv =0 < decemb =11
date1=datedujour.getTime();
date2=date_even.getTime();
nbrej= date1-date2;
nbrej= Math.round((Math.round(nbrej)/1000)/60/60/24);
document.write(""+nbrej+"");