monthNames = new Array(12);
monthNames[0] = "January";
monthNames[1] = "February";
monthNames[2] = "March";
monthNames[3] = "April";
monthNames[4] = "May";
monthNames[5] = "June";
monthNames[6] = "July";
monthNames[7] = "August";
monthNames[8] = "September";
monthNames[9] = "October";
monthNames[10] = "November";
monthNames[11] = "December";
function calcpmt(form){
if (form.principal.value.length==0){
alert("Please enter the Deposit Amount.");
return;
}
if (form.rate.value.length==0){
alert("Please enter the interest rate.");
return;
}
if ((form.rate.value > 30) || (form.rate.value < 3))
{
alert("Please enter a loan rate between 3% and 30%.");
return;
}
if (form.term.value.length==0){
alert("Please enter the term in years.");
return;
}
if ((form.term.value > 30) || (form.term.value < 1))
{
alert("Please enter a term between 1 and 30 years.");
return;
}
for (var j=0; j < form.principal.value.length; j++) {
var ch=form.principal.value.substring(j,j+1);
if ((ch < "0" || "9" < ch) && ch != ".") {
alert("c="+ch);
alert("The principal amount contains an invalid character ="+ch);
return;
}
}
for (var j=0; j < form.rate.value.length; j++) {
var ch=form.rate.value.substring(j, j + 1);
if ((ch < "0" || "9" < ch) && ch !=".") {
alert("The interest rate contains an invalid character");
return;
}
}
for (var j=0; j < form.term.value.length; j++) {
var ch=form.term.value.substring(j,j + 1);
if (ch < "0" || "9" < ch) {
alert("The loan term contains an invalid character");
return;
}
}
var i=(form.rate.value/12)/100;
var prin=form.principal.value;
var temp=Math.exp(Math.log(1+i)*(12*form.term.value));
var pmt=prin / ((1-(1/temp))/i);
form.payment.value=pmt;
roundoff(form);
if (form.full.checked) {
showschedule(form);
}
}
function clearform(form) {
form.payment.value="";
form.principal.value="";
form.term.value="";
form.rate.value="";
}
function roundoff(form) {
var r="";
for (var j=0;j < form.payment.value.length;j++){
if (form.payment.value.substring(j,j+1)=="."){
r = r+form.payment.value.substring(j,j+3);
break;
}
r = r + form.payment.value.substring(j,j+1);
}
form.payment.value=r;
}
function roundit(amt){
var r = "";
var s = ""+amt;
for (var j=0;j < s.length;j++){
if (s.substring(j,j+1)=="."){
r = r+s.substring(j,j+3);
break;
}
r = r + s.substring(j,j+1);
}
return r;
}
function showschedule(form){
var balance=form.principal.value;
var pmt=form.payment.value;
var totint=0;
var totprin=0;
var interest = 0;
var prin = 0;
var year = form.year.value % 100; // get only the last 2 digits from the year 1995 => 95
var month = form.month.options[form.month.selectedIndex].value;
var curDate = new Date(year, month, 1);
w=window.open("","schedule2","resizable,scrollbars=yes,toolbar=yes,width=550,height=350");
w.document.open("text/html");
w.document.writeln("");
w.document.writeln("");
w.document.writeln("Amortization Schedule");
w.document.writeln("");
w.document.writeln("");
w.document.writeln("");
w.document.writeln("
Amortization Schedule
");
w.document.writeln("
Close window before the next calculation ");
w.document.writeln("
");
w.document.writeln(" Principal Amount: $");
w.document.writeln(form.principal.value);
w.document.writeln(" Interest Rate: "+form.rate.value+"%");
w.document.writeln(" Term in Years: "+form.term.value+" years");
w.document.writeln(" Payment Amt: "+form.payment.value);
w.document.writeln(" First Payment Date: "+curDate);
month = parseInt(month);
for (var i=1;i<=form.term.value;i++){
w.document.writeln("