function trim(str)
{
     return str.replace(/^\s+/g, '').replace(/\s+$/g, '');
}

function dosum(formvariable, calculateamortize) {
teststate = true
 frm = document.MORTGAGE;
 while (teststate) {
      if (trim(frm.AMOUNT.value) == "" && trim(frm.AMOUNT.value) == "" || trim(frm.RATE.value) == "" && trim(frm.RATE.value) == "")
	  { alert("Please enter valid numerical data in all fields!");
         break
	  }
      if (!GenerateValue(formvariable))
         break
     if (!GeneratePage(formvariable, calculateamortize))
         break
      if (teststate) {
          teststate = false
      }
   }
   teststate = true
} 
function GenerateValue(formvariable) 
{  
  var tmp1, tmp2, tmp3, tmp4 
  tmp1 = parseFloat(frm.AMOUNT.value);
		
  if (isNaN(tmp1)) tmp1=0;
  tmp2 = parseFloat(frm.RATE.value);
		
  if (isNaN(tmp2)) tmp2=0;
  tmp3 = parseFloat(frm.YEARS.options[frm.YEARS.selectedIndex].value);
		
  if (isNaN(tmp3)) tmp3=0;
  if (frm.FREQUENCY.value = "Monthly")
  { 
	tmp4 = 12;
  }
  else
  {
	tmp4 = 26 ;
  }
   Payment = (tmp1*((tmp2/(tmp4*100))/(1-(Math.pow(1+(tmp2/(tmp4*100)),((tmp3*tmp4)*-1))))));
   Interest = ((Payment*(tmp3*tmp4))-tmp1);	
   frm.PAYMENT.value = formatCurrency(Payment);
   frm.INTEREST.value = formatCurrency(Interest);
  return(true)
}


function formatCurrency(num) 
{	
	num = num.toString().replace(/\$|\,/g,'');
	if(isNaN(num))
		num = "0";
		sign = (num == (num = Math.abs(num)));
		num = Math.floor(num*100+0.50000000001);
		cents = num%100;
		num = Math.floor(num/100).toString();
	if(cents<10)
		cents = "0" + cents;
	for (var i = 0; i < Math.floor((num.length-(1+i))/3); i++)
		num = num.substring(0,num.length-(4*i+3))+','+
		num.substring(num.length-(4*i+3));
	return (((sign)?'':'-') + '$' +  num + '.' + cents);
}


function GeneratePage(formvariable, calculateamortize)
{
	var tmp1, tmp2
	tmp1 = document.MORTGAGE.AMOUNT.value;
	tmp2 = document.MORTGAGE.RATE.value;
	tmp3 = document.MORTGAGE.YEARS.options[document.MORTGAGE.YEARS.selectedIndex].value;
	   if (calculateamortize.name == "cmdCalc") {
		  return(false)
		}

	   //if (confirm("An Amortization Table calculates the periodic payment breakdown for each specific category listed.")) {
		  body = ("<table class='Content' border='0' width='100%'>");
		  createtable(formvariable)
		  body = (body +"</table>");    
		  varBody = body;
		  varTmp1 = formatCurrency(tmp1);
		  varTmp2 = tmp2;
		  varTmp3 = tmp3;
		  calcAmortize(varTmp1,varTmp2,varTmp3,varBody);
		  return(true)
		//}
	  //return(false)
}

function createtable(formvariable)
{
	var tmp3
 if (frm.FREQUENCY.value = "Monthly")
  { 
	tmp3 = 12;
  }
  else
  {
	tmp3 = 26 ;
  }
   var currInterest = 0
   var currPrin = 0
   prevBalance = frm.AMOUNT.value;
   InterestRate = ( frm.RATE.value /100) / tmp3;
   MonthlyPayment = Payment;   
   currStart = document.MORTGAGE.START.options[document.MORTGAGE.START.selectedIndex].value;  
   for(i=1;i<=30;i++) {
      for(j=1;j<=tmp3;j++) {
         periodInterest = prevBalance * InterestRate;
         periodPrin = MonthlyPayment - periodInterest;
         currBalance = prevBalance - periodPrin;
         currInterest += periodInterest;
         currPrin += periodPrin;
         prevBalance = currBalance;
      }
      if( currBalance <= 0 )   currBalance = 0;
      body = (body +"<TR><TD WIDTH=25%>"+ currStart +"</TD><TD WIDTH=25%>"+ formatCurrency(currInterest) +"&nbsp;</TD><TD WIDTH=25%>"+ formatCurrency(currPrin) +"&nbsp;</TD><TD WIDTH=25%>"+ formatCurrency(currBalance)+"&nbsp;</TD></TR>");
      currInterest = 0
      currPrin = 0
      currStart = parseInt(currStart)
      currStart += 1
      if(currBalance<=0) {
         return(true)
      }  
   }
   return (true)
}

function MyCheckEnteredValue(element) {
	var lField = ltrim(rtrim(String(element.value)));

    myReg=new RegExp("^[0-9]*\\.?[0-9]*$"); 
        if (!(myReg.test(lField) && lField!='.')) {
			alert("Only numeric values are allowed!");
			element.focus();
			element.select();
			return false;
		}

	element.value=lField; 
	return true;
}


function rtrim(argvalue) {

  while (1) {
    if (argvalue.substring(argvalue.length - 1, argvalue.length) != " ")
      break;
    argvalue = argvalue.substring(0, argvalue.length - 1);
  }
  return argvalue;
}

function ltrim(argvalue) {

  while (1) {
    if (argvalue.substring(0, 1) != " ")
      break;
    argvalue = argvalue.substring(1, argvalue.length);
  }
    return argvalue;
}
function setData() {
	var mortgageAmount = parent.opener.varTmp1;
	var interestRate = parent.opener.varTmp2;
	var mortgageLength = parent.opener.varTmp3;
	var data = parent.opener.varBody;
	document.getElementById("MA").innerHTML = mortgageAmount;
	document.getElementById("IR").innerHTML = interestRate;
	document.getElementById("ML").innerHTML = mortgageLength;
	document.getElementById("Data").innerHTML = data;
}
function calcAmortize(param1, param2, param3, param4) {
	var launchURL = "amortize/index.php?" + "MA=" + param1 + "&IR=" + param2 + "&ML=" + param3 + "&Data=" + param4;
	GP_AdvOpenWindow(launchURL,'amortize','fullscreen=no,toolbar=no,location=no,status=no,menubar=no,scrollbars=no,resizable=no,channelmode=no,directories=no',525,479,'center','ignoreLink','',0,'',0,1,5,'');
}