function Countdown(then)
{
	this.then = then;

	function setElement(id, value)
	{
		if (value.length < 2) {
			value = "0" + value;
		}

		window.document.getElementById(id).innerHTML = value;
	}

	function countdown()
	{
		now  		  = new Date();
		diff		  = new Date(this.then - now);

		seconds_left  = Math.floor(diff.valueOf() / 1000);

		seconds  = Math.floor(seconds_left / 1) % 60;
		minutes  = Math.floor(seconds_left / 60) % 60;
		hours    = Math.floor(seconds_left / 3600) % 24;
		days     = Math.floor(seconds_left / 86400) % 86400;

		setElement('countdown-days', days);
		setElement('countdown-hours', hours);
		setElement('countdown-minutes', minutes);
		setElement('countdown-seconds', seconds);

		countdown.timer = setTimeout(countdown, 1000);
	}


	function start()
	{
		countdown();
		this.timer = setTimeout(countdown, 1000);
	}

	start(then);
}