function stripNum(num) {

var iPercent
var iDollar
var iSpace
var iComma
var numLength = num.length

//lalalla Line #114

if(numLength > 0) {

   num=num.toString();

   iPercent = num.indexOf("%");
   if(iPercent >= 0) {
      num=num.substring(0,iPercent) + "" + num.substring(iPercent + 1,numLength);
      numLength=num.length;
      }
   iDollar = num.indexOf("$");
   if(iDollar >= 0) {
      num=num.substring(0,iDollar) + "" + num.substring(iDollar + 1,numLength);
      numLength=num.length;
      }
   iSpace = num.indexOf(" ");
   if(iSpace >= 0) {
      num=num.substring(0,iSpace) + "" + num.substring(iSpace + 1,numLength);
      numLength=num.length;
      }
   iComma = num.indexOf(",");
   if(iComma >= 0) {
      while(iComma >=1) {
         num=num.substring(0,iComma) + "" + num.substring(iComma + 1,numLength);
         numLength=num.length;
         iComma = num.indexOf(",");
      }
      }

      num = eval(num);


} else {

num = 0;

}

return num;

}
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 == "" || form.principal.value == 0) {
   alert("Please enter the principal balance of your current mortgage.");
   form.principal.focus();
   } else
      if(form.interest.value == "" || form.interest.value == 0) {
      alert("Please enter the interest rate of your current mortgage.");
      form.interest.focus();
} else
      if(form.origPmt.value == "" || form.origPmt.value == 0) {
      alert("Please enter your current monthly mortgage payment (principal and interest portion only).");
      form.origPmt.focus();
   } else
      if(form.noYears.value == "" || form.noYears.value == 0) {
      alert("Please enter the number of years you would like to pay off your mortgage in.");
      form.noYears.focus();
   } else {

var Vprincipal = stripNum(form.principal.value);
var i = stripNum(form.interest.value);

    if (i >= 1.0) {

        i = i / 100.0;

    }

     i /= 12;

VnoYears = stripNum(form.noYears.value);
VorigPmt = stripNum(form.origPmt.value);

var noMonths = VnoYears * 12;

var pow = 1;

    for (var j = 0; j < noMonths; j++)

        pow = pow * (1 + i);

var newPmt = (Vprincipal * pow * i) / (pow - 1);

if(newPmt <= VorigPmt) {
   alert("Given the terms you entered your mortgage is already scheduled to be paid off in less than " + VnoYears + " years.");
   return;

} else {

   var VpmtAdd = eval(newPmt) - eval(VorigPmt);

   form.pmtAdd.value = "$" + formatNumber(VpmtAdd);

   var prin = stripNum(form.principal.value);
   var count = 0;
   var prinPort = 0;
   var intPort = 0;
   var accumInt = 0;
   var pmt = stripNum(form.origPmt.value);

   while(eval(prin) > eval(pmt)) {
      intPort = prin * i;
      accumInt = eval(accumInt) + eval(intPort)
      prinPort = eval(pmt) - eval(intPort);
      prin = eval(prin) - eval(prinPort);
      count = eval(count) + eval(1);

         if(count > 600) {
            alert("At the terms you entered your mortgage will never be paid off. Please either decrease the principal or increase the monthly payment amount.");
            clearResults(form);
            return;
            break;
         }
      }


   var VorigInt = accumInt;
   var VnewInt = (eval(newPmt * noMonths)) - eval(Vprincipal);
   var VintSave = eval(VorigInt) - eval(VnewInt);

   form.intSave.value = "$" + formatNumber(VintSave);

   var Vresults = ("If you would like to pay off your mortgage in " + VnoYears + " years instead of the current " + formatNumber(count / 12) + " years, you will need to start making a second monthly mortgage payment in the amount of $" + formatNumber(VpmtAdd) + ". This will cut your current mortgage interest cost from $" + formatNumber(accumInt) + " down to $" + formatNumber(VnewInt) + ", a savings of $" + formatNumber(VintSave) + " in interest charges.");

   form.results.value = Vresults;

   }

  }

}

function clearResults(form) {

   form.pmtAdd.value = "";
   form.intSave.value = "";
   form.results.value = "";
}