// inflation script January 2008
 
  var amount;
  var inflation_rate;
  var number_years;
  var future_value;
  var required_value;
  
  function CurrencyFormatted(amount)
  {
	var i = parseFloat(amount);
	if(isNaN(i)) { i = 0.00; }
	var minus = '';
	if(i < 0) { minus = '-'; }
	i = Math.abs(i);
	i = parseInt((i + .005) * 100);
	i = i / 100;
	s = new String(i);
	if(s.indexOf('.') < 0) { s += '.00'; }
	if(s.indexOf('.') == (s.length - 2)) { s += '0'; }
	s = minus + s;
	return s;
  }
// end of function CurrencyFormatted()

function CommaFormatted(amount)
{
	var delimiter = ","; // replace comma if desired
	var a = amount.split('.',2)
	var d = a[1];
	var i = parseInt(a[0]);
	if(isNaN(i)) { return ''; }
	var minus = '';
	if(i < 0) { minus = '-'; }
	i = Math.abs(i);
	var n = new String(i);
	var a = [];
	while(n.length > 3)
	{
		var nn = n.substr(n.length-3);
		a.unshift(nn);
		n = n.substr(0,n.length-3);
	}
	if(n.length > 0) { a.unshift(n); }
	n = a.join(delimiter);
	if(d.length < 1) { amount = n; }
	else { amount = n + '.' + d; }
	amount = minus + amount;
	return amount;
}
// end of function CommaFormatted()
  
	function formatCurrency(strValue)
    {
	strValue = strValue.toString().replace(/\$|\,/g,'');
	dblValue = parseFloat(strValue);

	blnSign = (dblValue == (dblValue = Math.abs(dblValue)));
	dblValue = Math.floor(dblValue*100+0.50000000001);
	intCents = dblValue%100;
	strCents = intCents.toString();
	dblValue = Math.floor(dblValue/100).toString();
	if(intCents<10)
		strCents = "0" + strCents;
	for (var i = 0; i < Math.floor((dblValue.length-(1+i))/3); i++)
		dblValue = dblValue.substring(0,dblValue.length-(4*i+3))+','+
		dblValue.substring(dblValue.length-(4*i+3));
	return (((blnSign)?'':'-') + '$' + dblValue + '.' + strCents);
    }
	
   function power(interest_rate,number_payments)
   {
   var add_one = 1 + interest_rate;
   var pow = Math.pow(add_one,number_payments);
   return pow;
   } 

  function calculate(form) {
  amount = form.amount.value;
  inflation_rate = form.inflation_rate.value;
  number_years = form.number_years.value;
  
  future_value = amount/(power(inflation_rate/100,number_years)); // discount amount
  future_value = Math.round(100*future_value)/100;
  
  required_value = amount*(power(inflation_rate/100,number_years)); // compound amount
  required_value = Math.round(100*required_value)/100;
  
  var result = CurrencyFormatted(future_value);
  result = CommaFormatted(result);
 // result = formatCurrency(result);
  form.future_value.value = result; 
  
  var result = CurrencyFormatted(required_value);
  result = CommaFormatted(result);
 //result = formatCurrency(result);  
  form.required_value.value = result; 
  
  } // end function