function change_class(class_old, nom_id, numero_id) {
	
	var i = 1;
	while (i < 500) {
		
		var id_planning_jour = nom_id+'-'+i;
		
		if (document.getElementById(id_planning_jour)) {
			
			if (numero_id == i) {
				
				document.getElementById(id_planning_jour).className = class_old+'-actif';
			}
			else {
				
				document.getElementById(id_planning_jour).className = class_old;
			}
		}
		else {
		
			break;
		}
		i++;
	}
}