//countdown_clock(11, 05, 23, 09, 00, 1)

function countdown_clock(year, month, day, hour, minute, format) {
	//I chose a div as the container for the timer, but
	//it can be an input tag inside a form, or anything
	//who's displayed content can be changed through
	//client-side scripting.
	html_code = '<div id="countdown"></div>';

	document.write(html_code);

	countdown(year, month, day, hour, minute, format);
}

function countdown(year, month, day, hour, minute, format) {
	Today = new Date();
	Todays_Year = Today.getFullYear() - 2000;
	Todays_Month = Today.getMonth() + 1;

	//Convert both today's date and the target date into miliseconds.                           
	Todays_Date = (new Date(Todays_Year, Todays_Month, Today.getDate(),
                                 Today.getHours(), Today.getMinutes(), Today.getSeconds())).getTime();
	Target_Date = (new Date(year, month, day, hour, minute, 00)).getTime();

	//Find their difference, and convert that into seconds.                  
	Time_Left = Math.round((Target_Date - Todays_Date) / 1000);

	if (Time_Left < 0)
		Time_Left = 0;

	switch (format) {
		
		case 0:
			//The simplest way to display the time left.
			document.all.countdown.innerHTML = Time_Left + ' seconds';
			break;
		case 1:
			//More datailed.
			days = Math.floor(Time_Left / (60 * 60 * 24));
			Time_Left %= (60 * 60 * 24);
			hours = Math.floor(Time_Left / (60 * 60));
			Time_Left %= (60 * 60);
			minutes = Math.floor(Time_Left / 60);
			Time_Left %= 60;
			seconds = Time_Left;

			dps = 'S'; hps = 'S'; mps = 'S'; sps = 'S';
			//ps is short for plural suffix.
			if (days == 1) dps = '';
			if (hours == 1) hps = '';
			if (minutes == 1) mps = '';
			if (seconds == 1) sps = '';

			$('countdown').innerHTML = '<big>' + days + ' DAY' + dps + '</big><br/>';
			$('countdown').innerHTML += hours + ' : ';
			$('countdown').innerHTML += minutes + ' : ';
			$('countdown').innerHTML += seconds;
			break;
		default:
			$('countdown').innerHTML = Time_Left + ' seconds';
	}

	//Recursive call, keeps the clock ticking.
	setTimeout('countdown(' + year + ',' + month + ',' + day + ',' + hour + ',' + minute + ',' + format + ');', 1000);
}