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JavaScript: formatting number with exactly two decimals

Can some one please help me with my java script?
My java script consistently counts up, the problem is the cents character length is way too long (need 2 characters max). Another problem is, I don’t know what code additionally I need to put commas in the correct position for determining the proper amount. Example: 12345.67 vs 12,345.67. If some one can just take a look at the code, modify it and re-post the full code since I have no idea what to do, I would deeply appreciate it.

This is the javascript code: http://jsfiddle.net/pqsH6/

---

<p style="float:left;">Money Saved: </p><b><p id="ds"  style="float:left;">$</p></b>
<div id="counter" style="float:left;"></div>

<script type="text/javascript">
    var START_DATE = new Date("january 1, 2012 12:00:00"); // put in the starting date here   
    var INTERVAL = 1000; // savings per second
    var INCREMENT = 0.005; // money saved per second
    var START_VALUE = -50000; // configures proper savings calculation
    var count = 0;
    window.onload = function()
    {
        var msInterval = INTERVAL * 1;
        var now = new Date();
        count = parseInt((now - START_DATE)/msInterval) * INCREMENT + START_VALUE;
        document.getElementById('counter').innerHTML = count;
        setInterval("count += INCREMENT; document.getElementById('counter').innerHTML = count;", msInterval);
    }
</script>​

Answer 1

This looks like a way to format your output with commas using Javascript:

How to print a number with commas as thousands separators in JavaScript

function numberWithCommas(x) {
    return x.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",");
}

Just pass your numbers through the function as a parameter and it will return a comma delimited number.

Here’s another function you can use to round out to two decimal places:

function formatCurrency(num) {
    num = isNaN(num) || num === '' || num === null ? 0.00 : num;
    return parseFloat(num).toFixed(2);
}

Then use the function like this

var roundedCurrencyAmt = numberWithCommas(formatCurrency(amtOfMoney));

Here’s a working jsFiddle: http://jsfiddle.net/alexfromapex/Y2x8m/2/