// FINANCE CALC FORM
  function validateFields4() {
	var forminvalid = false;
	var formtext = "";
	formtext = 'Error! Please include the following details:\n\n';
	if (document.calc.loan.value == "") {
		formtext = formtext + '  - Loan Amount\n';
		forminvalid = true;
	}
	if (document.calc.months.value == "") {
		formtext = formtext + '  - Terms\n';
		forminvalid = true;
	}
	if (document.calc.rate.value == "") {
		formtext = formtext + '  - Interest Rate\n';
		forminvalid = true;
	}
	if (forminvalid == true)
	{
		alert(formtext);
		return false;
	}
	else
	{
		return true;
	}
  }

// FINANCE CALCULATOR
function roundNumber(num, dec) {
	var result = Math.round(num*Math.pow(10,dec))/Math.pow(10,dec);
	return result;
}

function showpay() {
	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 = "Error! Please Try Again.";
 	} 
	else {
	 var princ = document.calc.loan.value;
	 var deposit = document.calc.deposit.value;
	 var term  = document.calc.months.value;
	 var intr   = document.calc.rate.value / 1200;
	 document.calc.pay.value = roundNumber((princ - deposit) * intr / (1 - (Math.pow(1/(1 + intr), term))),2);
	}
}