<!-- Returns Monthly Payment (http://www.jsmadeeasy.com/javascripts/Math%20Related/Loan%20Calculator/index.htm)
function resetresult()
{
document.getElementById("result").innerHTML="";
}

function calcpayment() {
	if (checkRequired("calc"))
	{
	var princ = document.getElementById("purchase_amount").value;
	var down = document.getElementById("down_payment").value;
	var term = document.getElementById("months").value;
	var intr = document.getElementById("annual_interest_rate").value / 1200;
//	var intr =(document.calc.annual_interest_rate.value/100)/360*30

	var MonthlyPayment=(princ-down) * (intr) / [ 1 - 1/Math.pow((1+intr), term)];
	//(princ-down) * intr / (1 - (Math.pow(1/(1 + intr), term)));
	MonthlyPayment=Math.round(MonthlyPayment * 100)/100;
	var totalPayments=term * (princ-down) * (intr) / [ 1 - 1/Math.pow((1+intr), term)];
	//MonthlyPayment*term;
	//
	//	=MonthlyPayment*term;
	//	totalPayments= term * MonthlyPayment = 

	var HTMLOutput
	HTMLOutput="<B>Calculation Results</B><br><br>"
	HTMLOutput+="<li>Your monthly payments will be: <b>$" + addComma(Math.round(MonthlyPayment*100)/100) + "</b>";
	HTMLOutput+="<li>Your total payments will be: <b>$" + addComma(Math.round((totalPayments)*100)/100) + "</b>";
	

	document.getElementById("result").innerHTML=HTMLOutput
	}
// payment = (principle-down payment) * monthly interest/(1 - (1/(1+MonthlyInterest)*Months))

}

