function calcul_mensualite() {
	var m = $('#montant').val();
	var t = $('#taux').val()/100;
	var t12 = t/12;
	var nm = $('#annee').val()*12;
	var men = m*t12*(Math.pow(1+t12,nm))/(Math.pow(1+t12,nm)-1);
	$("#mensualite").val(Math.round(men));
}

function calcul_montant() {
	var m = $('#mensualite').val();
	var t = $('#taux').val()/100;
	var t12 = t/12;
	var nm = $('#annee').val()*12;

	var mon = 12*m*(Math.pow(1+t12,nm)-1)/(Math.pow(1+t12,nm)*t);
	$("#montant").val(Math.round(mon));
}