function sni() {
	var i = parseFloat(document.form2.tax.value);
	var m = parseInt (document.form2.vers.value);
   	var a = parseInt(document.form2.old.value);
   	var t = parseInt(document.form2.exa.value);
   	var r = parseFloat(document.form2.rata.value);
   	var w = a*m;
	if(t==2) var sni = ((Math.pow((1+((i/100)/m)),w)-1)/((i/100)/m))
	else var sni = (1+((i/100)/m))*((Math.pow((1+((i/100)/m)),w)-1)/((i/100)/m))
	var mont = r * sni;
	document.form2.tot.value = Math.round(mont*10000)/10000;
}
function ani() {
	var i = parseFloat(document.form1.tasso.value);
	var m = parseInt (document.form1.versamenti.value);
   	var a = parseInt(document.form1.anni.value);
   	var t = parseInt(document.form1.modo.value);
   	var c = parseInt(document.form1.cap.value);
   	var w = a*m;
	if(t==2) var ani = ((1-Math.pow((1+((i/100)/m)),-w))/((i/100)/m))
	else var ani = ((1-Math.pow((1+((i/100)/m)),-w))/((i/100)/m))*(1+((i/100)/m))
	var rata = c/ani;
	document.form1.tot.value = Math.round(rata*10000)/10000;
}