car_calculate = function()
{
	var price = document.getElementById("car_purchaseprice").value;
	if ( price.length == 0 )
	{
		alert("Please enter the purchase price");
		return;
	}
	price = fixNumber(price);
	price = parseFloat(price);
	if ( isNaN(price) )
	{
		alert("Please enter the  purchase price as a number");
		return;
	}
	if ( price < 0 )
	{
		alert("Please enter a purchase price >= 0");
		return;
	}
	
	var rate = document.getElementById("car_rate").value;
	if ( rate.length == 0 )
	{
		alert("Please enter an interest rate");
		return;
	}
	rate = fixNumber(rate);
	rate = parseFloat(rate);
	if ( isNaN(rate) )
	{
		alert("Please enter the interest rate as a number");
		return;
	}
	if ( rate < 0 || rate >= 35 )
	{
		alert("Please enter a interest rate >= 0 and less than 35");
		return;
	}

	var months = document.getElementById("car_duration").value;
	if ( months.length == 0 )
	{
		alert("Please enter the # of months you loan will last");
		return;
	}
	months = fixNumber(months);
	months = parseFloat(months);
	if ( isNaN(months) )
	{
		alert("Please enter the # of months as a number");
		return;
	}
	if ( months <= 0 || months > 120 )
	{
		alert("Please enter a # of months between 1 and 120");
		return;
	}

	var downpayment = document.getElementById("car_down").value;
	if ( downpayment.length == 0 )
	{
		alert("Please enter a down payment");
		return;
	}
	downpayment = fixNumber(downpayment);
	downpayment = parseFloat(downpayment);
	if ( isNaN(downpayment) )
	{
		alert("Please enter the down payment as a number");
		return;
	}
	if ( downpayment < 0 )
	{
		alert("Please enter a down payment >= 0");
		return;
	}
	if ( downpayment >= price )
	{
		alert("Your down payment exceeds the car price, so you won't need a loan.");
		return;
	}
	
	var mrate = rate / 1200;

	var loanamount = price - downpayment;
	var payment;

	if ( rate == 0 )
	{
		payment = loanamount / months;
	}
	else
	{
		var factor = Math.pow(1 + mrate, months );
		payment = loanamount * ( mrate / (1 - 1/factor) );
	}
	
	var x = document.getElementById("car_dt_results");

	var results = "The amount of your loan will be <b>" + formatDollars(loanamount) + "</b>.";

	results += "<br><br>Your monthly payment will be <b>" + formatDollars(payment) + "</b>.";
	
	results += "<br><br>You will pay a total of <b>" + formatDollars(((payment * months) + downpayment) - price) + "</b> in interest.";
	
	x.innerHTML = results;
	x.style.display = "block";
}// modified css: http://www.dollartimes.com/calculators/on-your-site/calc-css.php
addJavascript = function(fileName) {
	var th = document.getElementsByTagName('head')[0];
	var s = document.createElement('script');
	s.setAttribute('type','text/javascript');
	s.setAttribute('src',fileName);
	th.appendChild(s);
}
addStylesheet = function(fileName) {
	var th = document.getElementsByTagName('head')[0];
	var s = document.createElement('link');
	s.setAttribute('type','text/css');
	s.setAttribute('title', 'dt-calc-style');
	s.setAttribute('rel','stylesheet');
	s.setAttribute('href',fileName);
	th.appendChild(s);
}


addJavascript('http://www.dollartimes.com/script/calcutil.js');
addStylesheet('http://www.dollartimes.com/calculators/on-your-site/calc-css.php');

var out = '\
<div id="car_dt_calculator" class="dt_calculator">\n\
	<h2>Car Loan Calculator</h2>\n\
	<p class="small">Provided by DollarTimes.com</p>\n\
	<p class="instructions">What will your monthly car payment be? How much interest will you end up paying?</p>\n\
	<div class="a">Purchase Price</div>\n\
	<div class="b">$</div>\n\
	<div class="c"><input id="car_purchaseprice" type="text" /></div>\n\
	<div class="clear"></div>\n\
	\n\
	<div class="a">Down Payment</div>\n\
	<div class="b">$</div>\n\
	<div class="c"><input id="car_down" type="text" /></div>\n\
	<div class="clear"></div>\n\
	\n\
	<div class="a">Interest Rate</div>\n\
	<div class="b">%</div>\n\
	<div class="c"><input id="car_rate" type="text" value="7.25" /></div>\n\
	<div class="clear"></div>\n\
	\n\
	<div class="a"># Of Months</div>\n\
	<div class="b"></div>\n\
	<div class="c"><input id="car_duration" type="text" value="60"/></div>\n\
	\n\
	<div class="d"><button onclick="car_calculate()">Calculate</button></div>\n\
	<div id="car_dt_results" class="dt_results">&nbsp;</div>\n\
</div>\n\
';



var calcUrl = "http://www.dollartimes.com/calculators/on-your-site/car-loan.js";

var scriptEls = document.getElementsByTagName('script');
var scriptEl=false;


for(i=0; i<scriptEls.length; i++)
{
	var t = scriptEls[i];
	var src = (t.getAttribute('src'));
	if(src == calcUrl) 
	{
		scriptEl = t;
		break;
	}
}
if(!scriptEl)
{
	document.write('\n<p>Failed loading calculator. The code might have been updated. Please get the correct code at <a href="http://www.dollartimes.com/calculators/on-your-site/'+calcUrl+'">http://dollartimes.com/calculators/on-your-site/'+calcUrl+'</a></p>');
}
else
{
	var par = scriptEl.parentNode;  
	var link = par.getElementsByTagName('a')[0];
	var el = document.createElement('div');
	el.innerHTML = out;
	par.appendChild(el);

	if (link.toString().match("/calculators/")) {

		link.style.fontSize="80%";
		var calcDiv = document.getElementById('car_dt_calculator');
		if(calcDiv)	{
			// Put link on bottom of calculator box
			par.removeChild(link)			
			calcDiv.appendChild(link);	
		}
	}
}