//DO NOT REMOVE THIS COPYWRITE INFO!
//Car Cost Comparison Calculator
//By Daniel C. Peterson
//Web Winder Website Services, 1997-2009  All Rights Reserved.
//Distribution, editing or reselling of this script is strictyly prohibited
//without expressed written permission from Daniel C. Peterson.
//For commercial grade (professional) versions of this and many other
//calculators, visit http://www.webwinder.com.

ageFact = new Array(28,20,16,8,6,5,4,3,2,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1)

function computeForm(form)

{
   
//Tax, License, and warranty Costs

   var tax1 = 0;
   var taxCost1 = 0;

   if(form.salesTax1.value >1) {tax1 = form.salesTax1.value / 100; } else {tax1 = form.salesTax1.value; }

   if(tax1 > 0) {taxCost1 = form.priceTag1.value * tax1; } else {taxCost1 = 0; }

   var licCost1 = 0;
   var warCost1 = form.warranty1.value;
   var totPurch1 = 0;

   licCost1 = form.license1.value * form.lifeExpect1.value;

   totPurch1 = eval(taxCost1) + eval(licCost1) + eval(warCost1);

   form.purchCost1.value = totPurch1;


//Depreciation Costs

   var timePass1 = eval(form.age1.value);
   var accumDeprec1 = ageFact[form.age1.value]; 

   while(timePass1 < eval(form.lifeExpect1.value) + eval(form.age1.value) - eval(1)) {
       timePass1 = eval(timePass1 + 1);
       accumDeprec1 = accumDeprec1 + ageFact[eval(timePass1 * 1)];
       if(timePass1 > 50) {break; } else {continue; }
   }

   form.depreCost1.value = accumDeprec1 / 100 * form.priceTag1.value;
      

//Finance Costs

   if(form.finance1.value == "n" || form.finance1.value == "N" || form.downPay1.value == 0 || form.intRate1.value == 0 || form.nPer1.value == 0) {
       form.downPay1.value = 0;
       form.intRate1.value = 0;
       form.nPer1.value = 0;
       form.intCost1.value = 0; } else {

   var int1 = form.intRate1.value;

    if (int1 > 1.0) {int1 = int1 / 100.0; form.intRate1.value = int1; }

    int1 /= 12;

    var prin1 = eval(form.priceTag1.value) + eval(taxCost1) + eval(form.license1.value) + eval(form.warranty1.value) - eval(form.downPay1.value);

    var pmt1 = 0;

    var pow1 = 1;

    for (var j1 = 0; j1 < form.nPer1.value; j1++)

        pow1 = pow1 * (1 + int1);

    pmt1 = (prin1 * pow1 * int1) / (eval(pow1) - eval(1));
		
		if(form.nPer1.value / 12 <= form.lifeExpect1.value) {form.intCost1.value = parseInt((pmt1 * form.nPer1.value) - prin1,10); } else {

        var intPort1 = 0;
        var PrinPort1 = 0;
        var count1 = 0;
        var accumPrin1 = 0;
        var accumInt1 =0;

    while(count1 < form.lifeExpect1.value * 12) {

           intPort1 = prin1 * int1;

           prinPort1 = pmt1 - intPort1;

           prin1 = prin1 - prinPort1;

           accumPrin1 = accumPrin1 + prinPort1;

           accumInt1 = accumInt1 + intPort1;

           count1 = count1 + 1;

           if(count1 > 600) {break; } else {continue; }

          }

     form.intCost1.value = parseInt(accumInt1,10);
       }
     }

//Operating Costs

   form.gas1.value = parseInt(form.miles1.value * form.lifeExpect1.value / form.mpg1.value * form.perGal1.value,10);

//Maintenance & Repair Costs

   form.maintCost1.value = parseInt(form.maint1.value * 12 * form.lifeExpect1.value,10);


//Insurance Costs

   form.insCost1.value = parseInt(form.insure1.value * form.lifeExpect1.value,10);

   
//Total Costs #1

   form.totCost1.value = parseInt(eval(totPurch1) + eval(form.depreCost1.value) + eval(form.intCost1.value) + eval(form.gas1.value) + eval(form.maintCost1.value) + eval(form.insCost1.value),10);

   form.annCost1.value = parseInt(form.totCost1.value / form.lifeExpect1.value,10);

   form.mileCost1.value = form.annCost1.value / form.miles1.value;

//Scenario #2

//100
//Purchase Costs 2

   if(form.priceTag2.value == 0) {
      form.salesTax2.value = form.salesTax1.value;
      form.warranty2.value = form.warranty1.value;
      form.license2.value = form.license1.value;
      form.purchCost2.value = form.purchCost1.value; } else {

   var tax2 = 0;
   var taxCost2 = 0;

   if(form.salesTax2.value >1) {tax2 = form.salesTax2.value / 100; } else {tax2 = form.salesTax2.value; }

   if(tax2 > 0) {taxCost2 = form.priceTag2.value * tax2; } else {taxCost2 = 0; }

   var licCost2 = 0;
   var warCost2 = form.warranty2.value;
   var totPurch2 = 0;

   licCost2 = form.license2.value * form.lifeExpect2.value;

   totPurch2 = eval(taxCost2) + eval(licCost2) + eval(warCost2);

   form.purchCost2.value = totPurch2;

   }

//Depreciation Costs #2

     if(form.priceTag2.value == 0) {
        form.age2.value = form.age1.value;
        form.lifeExpect2.value = form.lifeExpect1.value;
        form.depreCost2.value = form.depreCost1.value; } else {

    var timePass2 = eval(form.age2.value);
   var accumDeprec2 = ageFact[form.age2.value]; 

   while(timePass2 < eval(form.lifeExpect2.value) + eval(form.age2.value) - eval(1)) {
       timePass2 = eval(timePass2 + 1);
       accumDeprec2 = accumDeprec2 + ageFact[eval(timePass2 * 1)];
       if(timePass2 > 50) {break; } else {continue; }
       }

    form.depreCost2.value = accumDeprec2 / 100 * form.priceTag2.value;
     }

//Interest Costs #2

    if(form.priceTag2.value == 0) {
       form.finance2.value = form.finance1.value;
       form.intRate2.value = form.intRate1.value;
       form.downPay2.value = form.downPay1.value;
       form.nPer2.value = form.nPer1.value;
       form.intCost2.value = form.intCost1.value; } else {

   if(form.finance2.value == "n" || form.finance2.value == "N" || form.finance2.value == "") {
       form.downPay2.value = "n/a";
       form.intRate2.value = "n/a";
       form.nPer2.value = "n/a";
       form.intCost2.value = 0; } else {
   
    var int2 = form.intRate2.value;

    if (int2 > 1.0) {int2 = int2 / 100.0; form.intRate2.value = int2; }

    int2 /= 12;

    var prin2 = eval(form.priceTag2.value) + eval(taxCost2) + eval(form.license2.value) + eval(form.warranty2.value) - eval(form.downPay2.value);

    var pmt2 = 0;

    var pow2 = 1;

    for (var j2 = 0; j2 < form.nPer2.value; j2++)

        pow2 = pow2 * (1 + int2);

    pmt2 = (prin2 * pow2 * int2) / (eval(pow2) - eval(1));
		
		if(form.nPer2.value / 12 <= form.lifeExpect2.value) {form.intCost2.value = parseInt((pmt2 * form.nPer2.value) - prin2,10); } else {

        var intPort2 = 0;
        var PrinPort2 = 0;
        var count2 = 0;
        var accumPrin2 = 0;
        var accumInt2 =0;

    while(count2 < form.lifeExpect2.value * 12) {

           intPort2 = prin2 * int2;

           prinPort2 = pmt2 - intPort2;

           prin2 = prin2 - prinPort2;

           accumPrin2 = accumPrin2 + prinPort2;

           accumInt2 = accumInt2 + intPort2;

           count2 = count2 + 1;

           if(count2 > 600) {break; } else {continue; }

          }

       form.intCost2.value = parseInt(accumInt2,10);
        }
      }
    }

//Fuel Costs #2

   if(form.priceTag2.value == 0) {
      form.gas2.value = form.gas1.value;
      form.miles2.value = form.miles1.value;
      form.perGal2.value = form.perGal1.value;
      form.mpg2.value = form.mpg1.value; } else {

   form.gas2.value = parseInt(form.miles2.value * form.lifeExpect2.value / form.mpg2.value * form.perGal2.value,10);

    }

//Maint Costs #2

   if(form.priceTag2.value == 0) {
       form.maintCost2.value = form.maintCost1.value;
       form.maint2.value = form.maint1.value; } else {

   form.maintCost2.value = parseInt(form.maint2.value * 12 * form.lifeExpect2.value,10);

   }

//Insurance Costs #2

   if(form.priceTag2.value == 0) {
      form.insCost2.value = form.insCost1.value;
      form.insure2.value = form.insure1.value; } else {

   form.insCost2.value = parseInt(form.insure2.value * form.lifeExpect2.value,10);

   }

//Total Costs #2

   if(form.priceTag2.value == 0) {
      form.totCost2.value = form.totCost1.value;
      form.annCost2.value = form.annCost1.value;
      form.priceTag2.value = form.priceTag1.value;
      form.mileCost2.value = form.mileCost1.value; } else {

   form.totCost2.value = parseInt(eval(totPurch2) + eval(form.depreCost2.value) + eval(form.intCost2.value) + eval(form.gas2.value) + eval(form.maintCost2.value) + eval(form.insCost2.value),10);

   form.annCost2.value = parseInt(form.totCost2.value / form.lifeExpect2.value,10);

   form.mileCost2.value = form.annCost2.value / form.miles2.value;

   }

   var fsummary = 0;
   var scenario = "";

   if(form.annCost1.value > form.annCost2.value) {
   fsummary = eval(form.annCost1.value) - eval(form.annCost2.value);
   scenario = "Scenario #2"; } else {
   fsummary = eval(form.annCost2.value) - eval(form.annCost1.value);
   scenario = "Scenario #1"; 
   }

   form.summary.value = (scenario + " will save you " + parseInt(fsummary,10) + " per year.");
 
}


function clearForm(form)

{

    
    form.priceTag1.value = "";
    form.salesTax1.value = "";
    form.warranty1.value = "";
    form.license1.value = "";
    form.downPay1.value = "";
    form.insure1.value = "";
    form.finance1.value = "";
    form.intRate1.value = "";
    form.nPer1.value = "";
    form.miles1.value = "";
    form.mpg1.value = "";
    form.perGal1.value = "";
    form.maint1.value = "";
    form.age1.value = "";
    form.lifeExpect1.value = "";
    form.purchCost1.value = "";
    form.depreCost1.value = "";
    form.intCost1.value = "";
    form.insCost1.value = "";
    form.maintCost1.value = "";
    form.totCost1.value = "";
    form.annCost1.value = "";
    form.mileCost1.value = "";

    form.priceTag2.value = "";
    form.salesTax2.value = "";
    form.warranty2.value = "";
    form.license2.value = "";
    form.finance2.value = "";
    form.downPay2.value = "";
    form.insure2.value = "";
    form.intRate2.value = "";
    form.nPer2.value = "";
    form.miles2.value = "";
    form.mpg2.value = "";
    form.perGal2.value = "";
    form.maint2.value = "";
    form.age2.value = "";
    form.lifeExpect2.value = "";
    form.purchCost2.value = "";
    form.depreCost2.value = "";
    form.intCost2.value = "";
    form.insCost2.value = "";
    form.maintCost2.value = "";
    form.totCost2.value = "";
    form.annCost2.value = "";
    form.mileCost2.value = "";
    
    form.summary.value = "";


}