<!--
/* hide this code from non scriptable browsers


If you run into any problems while trying to configure this script, help 


is available.  A completely commented version and documentation are 


avaiable upon request.


       1) E-mail the author at: Qube@ix.netcom.com


                            MORTGAGE


COPYRIGHT NOTICE                                                         


Copyright 1997 Steven D. Witkop  All Rights Reserved.


Mortgage Script  may be used and modified free of charge by anyone so long as this 


copyright notice and the comments above remain intact.  By using this code you agree 


to indemnify Steven D. Witkop from any liability that  might arise from it's use.   


Selling the code for this program without prior written consent is  expressly forbidden.  In other 


words, please ask first before you try and  make money off of my program.  


Obtain permission before redistributing this software over the Internet or in any other medium. 


In all cases copyright and header must remain intact


 LANGUAGE: JavaScript 1.1 compliant


  PATTERN: MVC


*/


window.onerror=null


bState = true


oReq = new Collection("AMOUNT","RATE","","","","")


oVal = new Collection("AMOUNT","RATE","","","","")


oTst = new Collection("N","N","","","","")


function controller(oForm, oBtn) {


   while (bState) {


      if (!Required(oForm))


         break


      if (!Validate(oForm))


         break


      if (!SetValue(oForm))


         break


     if (!NewPage(oForm, oBtn))


         break


      if (bState) {


          bState = false


      }


   }


   bState = true


}


function Required(oView) {


   for (i in oView) {


      for (j in oReq) {


        if (i==oReq[j]) {      


           if (isMissing(oView[i])) {


               return(false)


           }


        }


     }


  }


  return(true)


}


function Validate(oView) {


   for (i in oView) {


      for (j in oVal) {


        if (i==oVal[j] && oTst[j]=="N") {      


           if (isTest(oView[i], oTst[j])) {


               return(false)


           }


        }


     }


  }


  return(true)


}


function SetValue(oView) {


   Mortgage = new Loan(oView.AMOUNT.value, oView.RATE.value, get_selection(oView.YEARS), 0, 0, get_selection(oView.FREQUENCY), 0 )


   Mortgage.calcPeriods()


   Mortgage.calcPayment()


   Mortgage.calcInterest()


   oView.PAYMENT.value = calcRound(Mortgage.Payment)


   oView.INTEREST.value = calcRound(Mortgage.Interest)


   setCookie("_Prin", Mortgage.Amount)


   setCookie("_Int", Mortgage.Rate)


   setCookie("_Year", Mortgage.Term)


   setCookie("_Tot", Mortgage.Interest)


   return(true)


}


function isMissing(oCtrl) {


   if (oCtrl.value == "") {  


      alert("You have left a required value blank. Please type a number") 


      oCtrl.focus()


      oCtrl.select()


      return(true)


      }


   else


      { 


      return(false)


   }


}


function isTest(oCtrl, oTest) {


   if (oTest=="N" && !isNumber(oCtrl.value) ) {


      alert(oCtrl.value+" contains an invalid character. Please type a number") 


      oCtrl.focus()


      oCtrl.select()


      return(true)


      }


      else


      { 


      return(false)


   }


}


function isNumber(input) {


   for (var i=0;i<input.length;i++) {


       var oneChar = input.substring(i, i+1)


       if (oneChar < "0" || oneChar > "9") {


          if (oneChar != "." ) { 


             return(false)


          }


       }


   }


   return(true)


}


function Collection(item1, item2, item3, item4, item5, item6) {


   this.item1 = item1


   this.item2 = item2


   this.item3 = item3


   this.item4 = item4


   this.item5 = item5


   this.item6 = item6


}


function Loan(Amount, Rate, Term, Payment, Interest, Frequency, Periods ) {


   this.Amount = Amount


   this.Rate = Rate


   this.Term = Term


   this.Payment = Payment


   this.Interest = Interest


   this.Frequency = Frequency


   this.Periods = Periods


   this.calcPeriods = calcPeriods


   this.calcPayment = calcPayment


   this.calcInterest = calcInterest


}


function calcPayment() {


   this.Payment = (this.Amount*((this.Rate/(this.Periods*100))/(1-(Math.pow(1+(this.Rate/(this.Periods*100)),((this.Term*this.Periods)*-1))))))


}


function calcInterest() {


   this.Interest = ((this.Payment*(this.Term*this.Periods))-this.Amount)


}


function calcPeriods() {


   if (this.Frequency=="Monthly") { this.Periods=12 } else { this.Periods=26 }


}


function calcRound(num) {


   result="$"+Math.floor(num)+"." 


   n = result.length


   if (num>1000 && num<999999) {  


     result="$"+result.substring(1,n-4)+","+result.substring(n-4,n)


   }


   if (num>1000000) {  


     result = "$"+result.substring(1,n-7)+","+result.substring(n-7,n-4)+","+result.substring(n-4,n)


   }


   var cents=100*(num-Math.floor(num))+0.5


   result += Math.floor(cents/10)


   result += Math.floor(cents%10)


   return(result)


}


function select_item(name, value) {  


   this.name = name  


   this.value = value


}


function get_selection(select_object) {   


   contents = new select_item()


   for(var i=0;i<select_object.options.length;i++)


      if(select_object.options[i].selected == true) {


        contents.name = select_object.options[i].text


        contents.value = select_object.options[i].value


      }      


   return(contents.name)


}


function setCookie (name, value ) {


  document.cookie = name + "=" + escape (value) + "; path=/"; 


}   


function NewPage(oForm, oBtn) {


   if (oBtn.name == "cmdCalc") {


      return(false)


    }


   if (confirm("An Amortization Table calculates the periodic payment breakdown for each specific category listed.")) {


      text = ("<HEAD><TITLE>Amortization Table</TITLE></HEAD>");


      text = (text +"<BODY BGCOLOR =  '#FFFFFF'><BR><BR>");


      text = (text +"<H2 ALIGN=CENTER><FONT COLOR=PURPLE>Amortization Table</FONT></H2>");


      text = (text +"<UL><FONT SIZE=-1>The following table is based on the information entered in the calculator form.</FONT></UL>");


      text = (text +"<UL><FONT SIZE=+1 COLOR=PURPLE>Mortgage Amount: </FONT>" +calcRound(Mortgage.Amount));


      text = (text +"<BR><FONT SIZE=+1 COLOR=PURPLE>  Interest Rate: </FONT>" + Mortgage.Rate + " %");


      text = (text +"<BR><FONT SIZE=+1 COLOR=PURPLE>Mortgage Length: </FONT>" +get_selection(oForm.YEARS) + " Years </UL>");


      text = (text +"<BR><CENTER><table border='1' width='100%'>");


      text = (text +"<TR><TD ALIGN=CENTER BGCOLOR=PURPLE><FONT COLOR=WHITE><B>Year</B></FONT></TD><TD ALIGN=RIGHT BGCOLOR=PURPLE><FONT COLOR=WHITE><B>Interest&nbsp;</B></FONT></TD><TD ALIGN=RIGHT BGCOLOR=PURPLE><FONT COLOR=WHITE><B>Principal&nbsp;</B></FONT></TD><TD ALIGN=RIGHT BGCOLOR=PURPLE><FONT COLOR=WHITE><B>Balance&nbsp;</B></FONT></TD></TR>\n");


      makeTable(oForm)


      text = (text +"</TABLE></CENTER>");


      msgWindow=window.open("","displayWindow","toolbar=no,width=500,height=300,directories=no,status=no,scrollbars=yes,resize=no,menubar=no")


      msgWindow.document.write(text)


      msgWindow.document.close()


      return(true)


    }


  return(false)


}


function makeTable(oView) {


   var currInt = 0


   var currPrin = 0


   prevBalance = Mortgage.Amount


   InterestRate = ( Mortgage.Rate /100) / Mortgage.Periods


   MonthlyPayment = Mortgage.Payment


   currStart = get_selection(oView.START)


   for(i=1;i<=30;i++) {


      for(j=1;j<=Mortgage.Periods;j++) {


         periodInt = prevBalance * InterestRate


         periodPrin = MonthlyPayment - periodInt


         currBal = prevBalance - periodPrin


         currInt += periodInt


         currPrin += periodPrin


         prevBalance = currBal


      }


      if( currBal <= 0 ){ 


         currBal = 0


      }


      text = (text +"<TR><TD ALIGN=CENTER>"+ currStart +"</TD><TD ALIGN=RIGHT>"+ calcRound(currInt) +"&nbsp;</TD><TD ALIGN=RIGHT>"+ calcRound(currPrin) +"&nbsp;</TD><TD ALIGN=RIGHT>"+ calcRound(currBal)+"&nbsp;</TD></TR>");


      currInt = 0


      currPrin = 0


      currStart = parseInt(currStart)


      currStart += 1


      if(currBal<=0) {


         return(true)


      }       


   }


   return (true)


}


function setfocus() {   


   document.MORTGAGE.AMOUNT.focus()


   document.MORTGAGE.AMOUNT.select()


}


// unhide
// -->