// JavaScript Document
var LoanAmt;
var Rate;
var Period;
var Payment;
var DwnPay;
var Mort;
var Price;
var Taxes;
var MaintCC,MOP;

function stripChars(pattern, str) {
         return str.replace(pattern,"");
		 }
		 
function CalcPayment(form) {
  // This calculates the payment amount from the other three values

  // Assign the values from the form
  
  
  DwnPay=stripChars(/\%|,/g, form.txtDown.value);
  
  Price=stripChars(/\$|,/g, form.txtPrice.value);
  
  Mort=parseInt(Price*(1-( DwnPay/100)));
  

  //LoanAmt = stripChars(/\$|,/g, form.txtMortgage.value);
  LoanAmt = Mort;
  
  Rate = parseFloat(form.txtMortgageInterestRate.value);

  Period = parseInt(form.txtMortgageLength.value)*12;

  // Validate the values that are coming from the form
  if (isNaN(LoanAmt)) {  alert("Missing Loan Amount");   return;  }
  if (isNaN(Rate))    {  alert("Missing Interest Rate."); CalcForm.txtMortgageInterestRate.focus(); return;  }
  if (isNaN(Period))  {  alert("Missing Period Value");  return;  }

  // The Rate is the yearly interest rate -- adjust to make a monthly rate.
  //   Also, the rate is a percentage, so divide by 100 to make the usable
  //   amount;
  if (Rate >= 1) { Rate /= 100; }
  Rate /= 12;

  // Calculate the payment based on the other three amounts
  Payment = LoanAmt *
               (Rate * Math.pow(1+Rate, Period)) /
                (Math.pow(1+Rate, Period) - 1);

  // Format the value by multiplying by 100, rounding the number, then
  //   dividing that result to get two decimal places
  Payment = Math.ceil(Payment*100) / 100;
  form.txtMonthlyMortgage.value = FormatCurrency(Payment.toString(),2);

  Taxes=stripChars(/\$|,/g, form.txtTaxes.value)*1;
  MaintCC=stripChars(/\$|,/g, form.txtMaintCC.value)*1;
  

  
  if (Taxes=="")
  	Taxes=0;
  if (MaintCC=="")
  	MaintCC=0 ;
  
  MOP=Payment+Taxes+MaintCC;
  
 

		var nMaintCCDeduct = form.txtDeductionPercent.value/100 * MaintCC;

		var nAdjMortgageInterest = 0;
		if (Mort > 1000000) 
			nAdjMortgageInterest = Rate * 1000000;  //only the first $1M of the mortgage may be tax deductible



		var nLostInterest = parseInt(Price*( 0/100)) * Rate;
		
		//var nTaxBracket = document.all.txtTaxBracket.value;
		var nTaxBracket = stripChars(/\%|,/g, form.txtTaxBracket.value);

		var nMortgageInterest = Mort * Rate;


		if (nAdjMortgageInterest == 0) 
			nTotalTaxReductions = nMortgageInterest + nMaintCCDeduct + Taxes;
		else
			nTotalTaxReductions = nAdjMortgageInterest + nMaintCCDeduct + Taxes;


		nTotalReduction = nTotalTaxReductions + nLostInterest;

		if (form.txtTaxBracket.value!="")  //Added by guang 2/26/99
			form.txtMonthlyAfterTax.value  = FormatCurrency(nTaxBracket*nTotalReduction/100,2);

		form.txtNetCost.value = FormatCurrency(MOP - (nTaxBracket*nTotalReduction/100),2)


  DisplayField();

  return;
}

function DisplayField()
{
	CalcForm.txtPrice.value=FormatCurrency(Price.toString(),0);
	CalcForm.txtMortgage.value=FormatCurrency(Mort.toString(),0);
	CalcForm.txtTaxes.value=FormatCurrency(Taxes.toString(),2);
	CalcForm.txtMaintCC.value=FormatCurrency(MaintCC.toString(),2);
	CalcForm.txtMOP.value=FormatCurrency(MOP.toString(),2);



}

function FormatCurrency(num,dec) {
num = num.toString().replace(/\$|\,/g,'');
if(isNaN(num))
num = "0";
sign = (num == (num = Math.abs(num)));
num = Math.floor(num*100+0.50000000001);
cents = num%100;
num = Math.floor(num/100).toString();
if(cents<10)
cents = "0" + cents;
for (var i = 0; i < Math.floor((num.length-(1+i))/3); i++)
num = num.substring(0,num.length-(4*i+3))+','+
num.substring(num.length-(4*i+3));
if (dec>0)
	return (((sign)?'':'-') + '$' + num + '.' + cents);
else
	return (((sign)?'':'-') + '$' + num);
}

function ValToMoney(Val, ConverMethod) {
  // Format the passed value as a float with two decimal places
  var FmtVal;
  var DecPos;

  // If the conversion method is 1, use the ceil() method to convert
  //   the value and not the round()
  if (ConverMethod == 1) {
    FmtVal = (Math.ceil(Val * 100) / 100).toString();
  }
  else {
    FmtVal = (Math.round(Val * 100) / 100).toString();
  }

  // Make sure it has two decimal places after the decimal point
  DecPos = FmtVal.indexOf('.');
  if (DecPos == -1)                   {  FmtVal += ''; }
  else if (DecPos == FmtVal.length-1) {  FmtVal += '00';  }
  else if (DecPos == FmtVal.length-2) {  FmtVal += '0';   }

  return FmtVal;
}