// JavaScript Document
function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}
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_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}
function MM_jumpMenu(targ,selObj,restore){ //v3.0
  eval(targ+".location='"+selObj.options[selObj.selectedIndex].value+"'");
  if (restore) selObj.selectedIndex=0;
}

function changemodel() 
{
var dropdownIndex = document.getElementById('model').selectedIndex;
var dropdownValue = document.getElementById('model')[dropdownIndex].value;
location.href="loan_calc.asp?mid="+dropdownValue+"";

}


function ComputeLoan()
{

	  var vloanamount = document.getElementById('lamt').value;
	  var vorgamount = document.getElementById('original_amt').value;
	  var vloanterm = document.getElementById('lterm').value;

   	if(vloanterm == '' || chkNumeric(vloanterm) == false || vorgamount == 0)
   	{
      	alert('Please enter a valid loan term.');
      	document.getElementById('lterm').focus();
      	return false;
   	}
   	else
   	{
		var loan_amt1 = vloanamount.replace(/,/g,'');
		if (loan_amt1 > Math.round(vorgamount))
		{
			alert('Please enter a valid amount, and ensure that it is less than the default loan amount. \nCommas are also not accepted.');
      		document.getElementById('lamt').focus();
      		return false;
		}
		else
		{	
			
			var loan_amt = parseFloat(loan_amt1);
			var interest = document.getElementById('interest').value;
			var loan_term = document.getElementById('lterm').value;
			
			var interest_decimal = interest / 100
			var v1  = ((loan_amt * interest_decimal) * loan_term) + loan_amt
			var loanperiod = loan_term * 12;
			var amt_payable = v1 / loanperiod
			
			document.getElementById('installment').value = dollarAmount(Math.round(amt_payable));
			
	
			return false;
		}
   }
}

function chkNumeric(strString)
{
   var strValidChars = "0123456789";
   var strChar;
   var blnResult = true;

   if (strString.length == 0) return false;

   //  test strString consists of valid characters listed above
   for (i = 0; i < strString.length && blnResult == true; i++)
      {
      strChar = strString.charAt(i);
      if (strValidChars.indexOf(strChar) == -1)
         {
         blnResult = false;
         }
      }
   return blnResult;
}

function ClearForm()
{
	document.getElementById('lterm').value = "";
	document.getElementById('lamt').value = document.getElementById('original_amt').value ;
	document.getElementById('installment').value = "";
	return false;
}


function checkNum(data) {      // checks if all characters
var valid = "0123456789.";     // are valid numbers or a "."
var ok = 1; var checktemp;
for (var i=0; i<data.length; i++) {
checktemp = "" + data.substring(i, i+1);
if (valid.indexOf(checktemp) == "-1") return 0; }
return 1;
}


function dollarAmount(amt) { // idea by David Turley
Num = "" + eval(amt);
dec = Num.indexOf(".");
end = ((dec > -1) ? "" + Num.substring(dec,Num.length) : ".00");
Num = "" + parseInt(Num);

var temp1 = "";
var temp2 = "";

if (checkNum(Num) == 0) {
alert("Please enter a valid amount, and ensure that it is less than the default loan amount. \nCommas are also not accepted.");
return "";
}
else {

if (end.length == 2) end += "0";
if (end.length == 1) end += "00";
if (end == "") end += ".00";

var count = 0;
for (var k = Num.length-1; k >= 0; k--) {
var oneChar = Num.charAt(k);
if (count == 3) {
temp1 += ",";
temp1 += oneChar;
count = 1;
continue;
}
else {
temp1 += oneChar;
count ++;
   }
}
for (var k = temp1.length-1; k >= 0; k--) {
var oneChar = temp1.charAt(k);
temp2 += oneChar;
}

temp2 = "$" + temp2 + end;

return temp2;
   }
}