function calculate_repayment()
	{
	document.monthlycalc.loanamount.value = ForceNumeric(document.monthlycalc.loanamount.value);
	document.monthlycalc.loanperiod.value = ForceNumeric(document.monthlycalc.loanperiod.value);
	document.monthlycalc.interestrate.value = ForceNumeric(document.monthlycalc.interestrate.value);
	var loanamount = document.monthlycalc.loanamount.value;
	var interestrate = document.monthlycalc.interestrate.value;
	var loanperiod = document.monthlycalc.loanperiod.value;
	
	if (interestrate > 0 && loanperiod > 0)
		{
		var I = interestrate / 12;
		var X = 1/(1+I/100);
		var N = loanperiod * 12;
		var L = loanamount;
		var P1 = 0;
		var P2 = loanamount;
		var A1 = FormatNumber((L - P1 * Math.pow(X,N)) * (X - 1)/(Math.pow(X,N+1)-X))
		var A2 = FormatNumber((L - P2 * Math.pow(X,N)) * (X - 1)/(Math.pow(X,N+1)-X))
		document.monthlycalc.repayment.value = A1;
		document.monthlycalc.interestonly.value = A2;
		}
	else
		{
		document.monthlycalc.repayment.value = "*ERROR*";
		document.monthlycalc.interestonly.value = "*ERROR*";
		}
	}


function calculate_maxloan()
	{
	document.maxborrowcalc.firstincome.value = ForceNumeric(document.maxborrowcalc.firstincome.value);
	document.maxborrowcalc.secondincome.value = ForceNumeric(document.maxborrowcalc.secondincome.value);
	var firstincome = document.maxborrowcalc.firstincome.value;
	var secondincome = document.maxborrowcalc.secondincome.value;
	if (firstincome > 0) 
		{
		if (secondincome == 0)
			{
			averageloanamount = firstincome * 3.25;	
			highestloanamount = firstincome * 4;
			}
		else
			{
			var jointincome = Math.abs(firstincome) + Math.abs(secondincome);
			averageloanamount = 2.5 * jointincome;
			highestloanamount = 3 * jointincome;
			}
		document.maxborrowcalc.average.value = FormatNumber(averageloanamount,0);
		document.maxborrowcalc.highest.value = FormatNumber(highestloanamount,0);
		}
	else
		{
		document.maxborrowcalc.average.value = "*ERROR*";
		document.maxborrowcalc.highest.value = "*ERROR*";
		}
	}


function FormatNumber(Number,Decimals,Separator)
{Number += ""          
 Decimals += ""        
 Separator += ""      
 if((Separator == "") || (Separator.length > 1))
  Separator = "."
 if(Number.length == 0)
  Number = "0"
 var OriginalNumber = Number  
 var Sign = 1
 var Pad = ""
 var Count = 0
 if(parseFloat(Number)){
  Number = parseFloat(Number)} else {
  Number = 0}
 if((parseInt(Decimals,10)) || (parseInt(Decimals,10) == 0)){
  Decimals = parseInt(Decimals,10)} else {
  Decimals = 2}
 if(Number < 0)
 {
  Sign = -1        
  Number *= Sign   
 }
 if(Decimals < 0)
  Decimals *= -1
 Number = "" + Math.floor(Number * Math.pow(10,Decimals + 1) + 5)
 if((Number.substring(1,2) == '.')||((Number + '')=='NaN'))
  return(OriginalNumber) 
 if(Number.length < Decimals +1)
 {
  for(Count = Number.length; Count <= Decimals; Count++)
   Pad += "0"
 }
 Number = Pad + Number 
 if(Decimals == 0){
  Number = Number.substring(0, Number.length -1)} else {
 Number = Number.substring(0,Number.length - Decimals -1) +
          Separator +
          Number.substring(Number.length - Decimals -1,
          Number.length -1)}
 if(Sign == -1)
  Number = "-" + Number 
 if(Number.length == 0)
  Number="0"
 return(Number)
}
function ForceNumeric(nValue)
	{
	validChars = "0123456789.";
	newValue="";
	for(k = 0; k < nValue.length; k++)
		{
		thisChar = nValue.charAt(k);
		if(validChars.indexOf(thisChar) != -1) newValue += thisChar;
		}
	return newValue;
	}
function close_window() {
    window.close();
}



function calculate_stamp()
  {
  
  var propertyvalue = document.stampcalc.propvalue.value;
  var stamp = 0.00
  
  if(propertyvalue>125000)
    {
	if(propertyvalue>250000)
	  {
	  if(propertyvalue>500000)
	    {
		stamp = FormatNumber((propertyvalue/100)*4, 2);
		}
	  else
	    {
		stamp = FormatNumber((propertyvalue/100)*3, 2);
		}
	  }
	else
	  {
	  stamp = FormatNumber(propertyvalue/100, 2); 
	  } 
	}
  document.stampcalc.stamp.value=Math.round(stamp);
  }