//CMMC.JS
//Copyright 2003-2006 Continental Mutual Mortgage Corporation
//All Rights Reserved.
function toCurrency(num)
{
num = Math.floor(num*100)/100;
var s = num.toString();
var c = s.length;
var i = s.indexOf('.');
if (i == 0)
s = "0." + s;
else
if (i < 0)
s += ".00";
else
if ((c - i) < 3)
s += "0";
return s;
}
function Floor(number)
{
return Math.floor((number+0.005)*100)/100;
}
function CalculatePayment(LoanAmount, InterestRate, Years)
{
var j = InterestRate / 1200;
var n = Years * 12;
var m = LoanAmount * (j / (1 - Math.pow((1 + j),-n)))
return Floor(m);
}
function Mortgage(LoanAmount, InterestRate, Years)
{
this.LoanAmount = LoanAmount;
this.InterestRate = InterestRate;
this.Years = Years;
this.Payment = CalculatePayment(LoanAmount, InterestRate, Years);
this.ShowAmortizationTable = ShowAmortizationTable;
}
function SetLoanAmount(LoanAmount)
{
this.LoanAmount = LoanAmount;
}
function SetInterestRate(InterestRate)
{
this.InterestRate = InterestRate;
}
function SetYears(Years)
{
this.Years = Years;
}
function ShowAmortizationTable()
{
// Here are the parameters for the popup window.
var width = 500;
var height = 400;
var left = (screen.width - width) / 2;
var top = (screen.height - height) / 2;
var popup = window.open('','printable', 'top=' + top + ',left=' + left + ',height=' + height + ',width=' + width + ',scrollbars,resizable');
//this writes out the header to the popup.
var head = 'Continental Mutual Mortgage Corp - Mortgage Calculator'+
'Disclaimer: The figures reflected are an estimate only. We believe these figures to be accurate, however, they are subject to review and calculation.
';
var closewin = '
';
//this writes out the monthly payment to the popup
popup.document.write(head + closewin);
popup.document.write('Monthly Payment: ' + this.Payment + '
');
//this writes out the amortization table to the popup
popup.document.write('
' +
'
' +
'
Payment No.
' +
'
Principal Balance
' +
'
Interest
' +
'
Principal
' +
'
');
var period = this.Years * 12;
var principalBalance = this.LoanAmount;
for (var i = 1; i <= period; i++)
{
var interestPayment = Floor(principalBalance * (this.InterestRate / 1200));
var principalPayment = Floor(this.Payment - interestPayment);
if (i % 2 == 0)
popup.document.write('