test.js

    // Countdown Clock
    function countdown(action) {

        function countItDown() {
            var cd = $('#countdown');
            if (cd.val() > 0) {
                cd.val(cd.val() - 1);
                setTimeout(countItDown, 1000);
            } else {
                clearTimeout();
            }
        }

        // Starts Countdown
        if (action === 'play') {
            setTimeout(countItDown, 1000);
        }

        // Stops Countdown (manually triggered)
        if (action === 'stop') {
            clearTimeout();
        }
    }