//*******************************************
//DO NOT REMOVE THIS COPYWRITE INFO!
//Payment Breakdown Calculator
//1998 Daniel C. Peterson ALL RIGHTS RESERVED
//Created: 08/21/1998
//Last Modified: 07/08/2002
//This script may not be copied, edited, distributed or reproduced
//without express written permission from
//Daniel C. Peterson of Web Winder Website Services
//For commercial use rates, contact:
//Dan Peterson:
//Web Winder Website Services
//P.O. Box 11
//Bemidji, MN  56619
//dan@webwinder.com
//http://www.webwinder.com
//Commercial User Licence #:5782-1237-49-1198
//Commercial Licence Date:2008-09-11
//*******************************************



function stripNum(num) {

   num=num.toString();


   var len = num.length;
   var rnum = "";
   var test = "";
   var j = 0;

   var b = num.substring(0,1);
   if(b == "-") {
      rnum = "-";
   }

   for(i = 0; i <= len; i++) {

      b = num.substring(i,i+1);

      if(b == "0" || b == "1" || b == "2" || b == "3" || b == "4" || b == "5" || b == "6" || b == "7" || b == "8" || b == "9" || b == ".") {
         rnum = rnum + "" + b;

      }

   }

   if(rnum == "" || rnum == "-") {
      rnum = 0;
   }

   rnum = Number(rnum);

   return rnum;

}



function formatNumber(num) {

var isNeg=0;

    if(num < 0) {
       num=num*-1;
       isNeg=1;
    }

    
	onum=Math.round(num*100)/100;
		
	integer=Math.floor(onum);

	if (Math.ceil(onum) == integer) {
		decimal="00";
	} else{
		decimal=Math.round((onum-integer)*100)
	}
	decimal=decimal.toString();
	if (decimal.length<2) decimal="0"+decimal;

	integer=integer.toString();
	var tmpnum="";
	var tmpinteger="";
	var y=0;

	for (x=integer.length;x>0;x--) {
		tmpnum=tmpnum+integer.charAt(x-1);
		y=y+1;
		if (y==3 & x>1) {
			tmpnum=tmpnum+",";
			y=0;
		}
	}

	for (x=tmpnum.length;x>0;x--) {
		tmpinteger=tmpinteger+tmpnum.charAt(x-1);
	}
		
	finNum=tmpinteger+"."+decimal;

    if(isNeg == 1) {
       finNum = "-" + finNum;
    }

	return finNum;
}


function computeForm(form) {

if(form.principal.value == 0 || form.principal.value == "") {
   alert("Please enter the loan's original principal amount.");
   form.principal.focus();
   } else
if(form.intRate.value == 0 || form.intRate.value == "") {
   alert("Please enter the loan's annual interest rate.");
   form.intRate.focus();
   } else
if(form.nPer.value == 0 || form.nPer.value == "") {
   alert("Please enter the loan's original number of monthly payments.");
   form.nPer.focus();
   } else
if(form.pmtAmt.value == 0 || form.pmtAmt.value == "") {
   alert("Please enter the loan's monthly payment amount.");
   form.pmtAmt.focus();
   } else
if(form.pmtNo.value == 0 || form.pmtNo.value == "") {
   alert("Please enter the payment number you would like broken down.");
   form.pmtNo.focus();
   } else {

var Vprincipal = stripNum(form.principal.value);
var VintRate = stripNum(form.intRate.value);
   if (VintRate > 1.0) {
   VintRate = VintRate / 100.0;
   } else {
   VintRate = VintRate;
   }
   VintRate /= 12;

var VnPer = stripNum(form.nPer.value);
var VpmtAmt = stripNum(form.pmtAmt.value);
var VpmtNo = stripNum(form.pmtNo.value);
var prinPort = 0;
var intPort = 0;
var count = 0;

while(count < VpmtNo) {
   intPort = Vprincipal * VintRate;
   prinPort = eval(VpmtAmt) - eval(intPort);
   Vprincipal = eval(Vprincipal) - eval(prinPort);
   count = eval(count) + eval(1);
   }

form.principalPort.value = "$" + formatNumber(prinPort);
form.interestPort.value = "$" + formatNumber(intPort);

   }

}