var loanType="carLoan";
 
function clickLoanTypeCarLoan()
{

		loanType="carLoan";
		document.loanpay.homeEquityRate.value="disabled";
		document.loanpay.homeEquityRate.disabled=true;
		
		document.loanpay.taxRate.value="disabled";
		document.loanpay.taxRate.disabled=true;
		
		document.loanpay.rate.disabled=false;
		document.loanpay.rate.value="";
		
		document.loanpay.rebate.value="0";
		//document.loanpay.loan.focus(); 
}
	
	
function clickLoanTypeHomeEquity()
{
		loanType="homeEquity";
		document.loanpay.rate.value="disabled";
		document.loanpay.rate.disabled=true;
		
		document.loanpay.homeEquityRate.disabled=false;
		document.loanpay.homeEquityRate.value="";
		
		document.loanpay.taxRate.disabled=false;
		document.loanpay.taxRate.value="";
		
		document.loanpay.homeEquityRate.focus();
		
}
 

function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_nbGroup(event, grpName) { //v6.0
  var i,img,nbArr,args=MM_nbGroup.arguments;
  if (event == "init" && args.length > 2) {
    if ((img = MM_findObj(args[2])) != null && !img.MM_init) {
      img.MM_init = true; img.MM_up = args[3]; img.MM_dn = img.src;
      if ((nbArr = document[grpName]) == null) nbArr = document[grpName] = new Array();
      nbArr[nbArr.length] = img;
      for (i=4; i < args.length-1; i+=2) if ((img = MM_findObj(args[i])) != null) {
        if (!img.MM_up) img.MM_up = img.src;
        img.src = img.MM_dn = args[i+1];
        nbArr[nbArr.length] = img;
    } }
  } else if (event == "over") {
    document.MM_nbOver = nbArr = new Array();
    for (i=1; i < args.length-1; i+=3) if ((img = MM_findObj(args[i])) != null) {
      if (!img.MM_up) img.MM_up = img.src;
      img.src = (img.MM_dn && args[i+2]) ? args[i+2] : ((args[i+1])? args[i+1] : img.MM_up);
      nbArr[nbArr.length] = img;
    }
  } else if (event == "out" ) {
    for (i=0; i < document.MM_nbOver.length; i++) {
      img = document.MM_nbOver[i]; img.src = (img.MM_dn) ? img.MM_dn : img.MM_up; }
  } else if (event == "down") {
    nbArr = document[grpName];
    if (nbArr)
      for (i=0; i < nbArr.length; i++) { img=nbArr[i]; img.src = img.MM_up; img.MM_dn = 0; }
    document[grpName] = nbArr = new Array();
    for (i=2; i < args.length-1; i+=2) if ((img = MM_findObj(args[i])) != null) {
      if (!img.MM_up) img.MM_up = img.src;
      img.src = img.MM_dn = (args[i+1])? args[i+1] : img.MM_up;
      nbArr[nbArr.length] = img;
  } }
}


function truncate(number) 
{
        //Ensure number is treated as a string
        tempval=number + "";
        if (tempval!="0") 
        {
                start=tempval.indexOf('.');
                if (start==-1) 
                {
                        start=tempval.length;  
                        tempval=tempval + ".";
                }
                deccount=(tempval.length - start) - 1; 
                if (deccount >= 2) 
                {
                        tempval=tempval.substring(0,start + 3);
                }
                else if (deccount==0) 
                {
                        tempval=tempval + "00";
                }
                else 
                        tempval=tempval + "0";
        }
        return (tempval);
}




function parseout(varname,trunc) 
{
        i=0; 
        min=1;
        holder=varname;
        temp2=""; 
        pernum=0;
        if (holder.value!="") 
        {
                while ((i < holder.value.length) && 
                         (pernum < 2)) 
                {         
                        if (holder.value.charAt(i)=='.') 
                        {
                                pernum++;
                                if (!trunc) 
                                {
                                        pernum=2;
                                }
                        }
                        if (pernum < 2) 
                        {
                                temp=holder.value.substring(i,i + 1);  
                                if (((parseInt(temp)>=min) && (parseInt(temp)<=9) && (temp==parseInt(temp))) || (temp=='.')) 
                                { 
                                        temp2=temp2 + temp;
                                        min=0;
                                } 
                        }
                        i++; 
                } // END WHILE
                if (temp2!="")
                {  
                        if (trunc) 
                        {
                                holder.value=truncate(temp2);
                        }
                        else 
                                holder.value=temp2;
                        return (holder.value);
                }
                else 
                {
                        holder.value=0;
                        return(0);
                }
        } // END IF
        else 
        {
                holder.value=0;
                return(0);
        }
}

 function truncate2(n,m,w)  
  {
    var str = "" + Math.round(n * Math.pow(10,m));
    while (str.length <= m)
      str = "0" + str;
    var decpoint = str.length - m;
    str = "$" + str.substr(0,decpoint) + "." + str.substring(decpoint,str.length);
    while (str.length < w)
      str = " " + str;
    return str;
  }
function calculate () 
{
		
        calc=document.loanpay;
        
  
        loanAmount=parseFloat(parseout(calc.loan,true));

        loanAmount=loanAmount-parseFloat(parseout(calc.rebate,true));
        loanAmount=loanAmount-parseFloat(parseout(calc.tradevalue,true));
        loanAmount=loanAmount-parseFloat(parseout(calc.downpayment,true));
        
         
        homeEquityRate=parseFloat(parseout(calc.homeEquityRate,true));
        taxRate=parseFloat(parseout(calc.taxRate,true));
        
       
        rate=parseFloat(parseout(calc.rate,true));
        months=parseFloat(parseout(calc.months,false));
        
        
       // if (document.loanpay.loanType.value=="carLoan")
        if (loanType=="carLoan")
        {
		
			if ((rate==0) || (months==0)) 
			{
			        if ((rate==0) && (months==0)) 
			        {
			                calc.payment.value=truncate(loanAmount);
			        }
			        else if (rate==0) 
			        {
			                calc.payment.value=truncate(loanAmount / months);
			        }
			        else 
			                calc.payment.value=truncate(loanAmount);
			                
			        calc.interest.value =  truncate2((calc.payment.value*months-loanAmount) ,2,9);
			         if (calc.payment.value*months-loanAmount<=0) calc.interest.value=0;
			       
			}
			
			if ((rate!=0) && (months!=0)) 
			{
			  //      payment=(loanAmount * rate * Math.pow(1 + (rate / 1200),months)) / (1200 * (Math.pow(1 + (rate / 1200),months) - 1));
				
				payment=loanAmount/((1-1/Math.pow((1+rate/1200),months))/(rate/1200));
			    calc.payment.value=truncate2(payment,2,9);
			    calc.interest.value =  truncate2((payment*months-loanAmount) ,2,9);
			}
        
        
			 
			
		}
		else
        {
        
			  payment = loanAmount / ((1.0 - Math.pow((1.0 /(1.0 + (homeEquityRate/100) * (1.0 - (taxRate/100)) / 12)), months)) / ((homeEquityRate/100) * (1.0 - (taxRate/100)) / 12.0));
			       
			        calc.payment.value=truncate2(payment,2,9);
					calc.interest.value =  truncate2((payment*months-loanAmount) ,2,9);
		}
}