<!--

function isNumber(num) {

  var strMsg = '';

	for (var i = 0; i < num.value.length; i++) {

	  if ((num.value.substring(i, i + 1) < "0" || "9" < num.value.substring(i, i + 1)) && num.value.substring(i, i + 1) != ".") {

		  strMsg = 'Number not valid.  Please check your entries to ensure proper entry.';

		}

	}

	if (strMsg.length == 0) {

	  return true;

	} else {

	  alert(strMsg);

		return false;

	}

}

function calculate(forma) {

  form = forma.form;

  //Check for null values

  if (form.amount.value.length == 0 || form.downpayment.value.length == 0 || form.tradein.value.length == 0) { return false; }

  //Check for valid numbers

  if (!isNumber(form.amount) || !isNumber(form.downpayment) || !isNumber(form.tradein)) { return false; }


  //Adjust Interest

  var interest = form.rate.value / 100.0;

  interest /= 12;


	//Get total loan amount

	var total = form.amount.value - form.downpayment.value - form.tradein.value;

	
	//Calculate payment

	var temp = 1;

	for (var j = 0; j < form.term.value; j++)

	    temp = temp * (1 + interest);

	payment = "" + .01 * Math.round(100*(total * temp * interest) / (temp - 1));


  //Format proper decimal places

	var wholenum = true;

	for (i = 0; i < payment.length; i++) {

	  if (payment.charAt(i) == ".") wholenum = false;

	}

  if (wholenum) {

	  payment = payment + ".00";

	} else {

	  if (payment.charAt(payment.length-2) == ".") {

		  payment = payment + "0";

		} else {

		  payment = Math.round(payment*100)/100;

		}

	}

	form.payment.value = '$'+payment;


}


function powercalculate(forma) {

  form = forma.form;

  //Check for null values

  if (form.poweramount.value.length == 0 || form.powerdownpayment.value.length == 0 || form.powertradein.value.length == 0) { return false; }

  //Check for valid numbers

  if (!isNumber(form.poweramount) || !isNumber(form.powerdownpayment) || !isNumber(form.powertradein)) { return false; }


  //Adjust Interest

  var interest = form.powerrate.value / 100.0;

  interest /= 12;


  //Calculate total amount

  var temp = 1;

  for (var j = 0; j < form.powerterm.value; j++)

        temp = temp * (1 + interest);


  var total = ((temp-1)*(form.poweramount.value)) / (temp * interest) +.5;

  total = Math.round(total);

  total = parseFloat(total) + parseFloat(form.powerdownpayment.value) + parseFloat(form.powertradein.value);


  //Format proper decimal places

	var wholenum = true;

	for (i = 0; i < total.length; i++) {

	  if (total.charAt(i) == ".") wholenum = false;

	}

  if (wholenum) {

	  total = total + ".00";

	} else {

	  if (total.charAt(total.length-2) == ".") {

		  total = total + "0";

		} else {

		  total = Math.round(total*100)/100;

		}

	}

	form.power.value = '$'+total;


}

//-->