function showpay() {
	var pay;
	
 if (
 	(document.calc.loan.value == null || document.calc.loan.value.length == 0) ||
     (document.calc.months.value == null || document.calc.months.value.length == 0)
		||
     (document.calc.rate.value == null || document.calc.rate.value.length == 0))
 { //document.calc.pay.value = "Incomplete data";
 	//alert("Incomplate Data");
  }
 else
 {
 var princ = document.calc.loan.value;
 var term  = document.calc.months.value;
 var intr   = document.calc.rate.value / 1200;
  pay = princ * intr / (1 - (Math.pow(1/(1 + intr), term)));
  document.calc.pay.value = addCommas(pay.toFixed(2));
 }

// payment = principle * monthly interest/(1 - (1/(1+MonthlyInterest)*Months))

}
function clearLoan(form) {
form.loan.value = "";
form.months.value = "";
form.rate.value = "";
form.pay.value = "";
}