// JavaScript Document


function removeCommas( strValue ) {
  var objRegExp = /,/g; //search for commas globally
  //replace all matches with empty strings
  return strValue.replace(objRegExp,'');
} 



function formatCurrency(num) {
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));
return (((sign)?'':'-') + '$' + num + '.' + cents);
}





function BoatFinanceCalc() { 
form = document.coastalcalc; 
LoanEnt= form.LoanAmount.value; 
LoanAmount = removeCommas(LoanEnt);
DownEnt = form.DownPayment.value ;
DownPayment= removeCommas(DownEnt);
AnnualInterestRate = form.InterestRate.value/100 ;
Years= form.NumberOfYears.value ;
MonthRate=AnnualInterestRate/12 ;
NumPayments=Years*12 ;
Prin=LoanAmount-DownPayment ;
MonthPayment=Math.floor((Prin*MonthRate)/(1-Math.pow((1+MonthRate),(-1*NumPayments)))*100)/100 ;
//form.NumberOfPayments.value=NumPayments ;
form.MonthlyPayment.value=formatCurrency(MonthPayment) ;
}