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 CalculatePayment(Rate,Years,LoanAmount){
		AnnualInterestRate = Rate/100;
		MonthRate=AnnualInterestRate/12;
		NumPayments=Years*12;
//		Prin=LoanAmount-DownPayment;
		Prin=LoanAmount; //assuming no down payment
		MonthPayment=Math.floor((Prin*MonthRate)/(1-Math.pow((1+MonthRate),(-1*NumPayments)))*100)/100;
		document.writeln(formatCurrency(MonthPayment));
	}