Countdown javascript app
<p>I have this piece of JavaScript which is part of a countdown timer I need to know how to preset the timer to only run for 48 hours every time the page is submitted ? at the moment I place a time in a it begins to countdown to that time. Please help!    </p>

<pre><code>&lt;script&gt;
    $(document).ready(function(){
        $("#countdown").countdown({
            date: "16 january 2013 16:45:00",
            format: "on"
        },

        function() {
            // callback function
        });
    });

&lt;/script&gt;
</code></pre>
