function calcul_immo(id)
	{
		var f = document.getElementById(id);
		
		var montant_pret = f.montant_pret.value;
		var taux =f.taux.value;
		
		var regEx = new RegExp(",","g");
		var taux = taux.replace(regEx,".");
		
		var taux = taux/100;
		var nb_mensualite = (f.nb_mensualite.value)*12;
		
		var calcul = exposant(taux,nb_mensualite);
		
		mensualite = montant_pret*taux/12*calcul;
		mensualite = mensualite/(calcul-1);
		
		f.mensualites.value = Math.ceil(mensualite*100)/100;
	
	}
	
	function exposant(c,e)
	{
		r = 1;
		c = 1+c/12;
		
		for(i=1;i<=e;i++){
			r *= c;
		}
		
		return r;
	}

	// fin du script -->