function tourtons(){
Today = new Date;
Mois = (Today.getMonth())+1;
if ((Mois<=3) || (Mois>=10)) {
var ind = (parseInt(Math.random()*4))+1;
var laclasse = 'hiver' + ind;
} else {
var ind = (parseInt(Math.random()*4))+1;
var laclasse = 'ete' + ind;
}
document.getElementById('spring').className = laclasse;}