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" class="countdown-text"></div>';

	document.write(html_code);

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

function countdown(year, month, day, hour, minute, format)
{
	if (document.all.countdown)
	{
		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 + ' seconden';
				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 = 'en'; hps = ''; mps = ''; sps = 'n';
				//ps is short for plural suffix.
				if(days == 1) dps ='';
				if(hours == 1) hps ='';
				if(minutes == 1) mps ='';
				if(seconds == 1) sps ='';

				document.all.countdown.innerHTML = 'Nog: ';
				document.all.countdown.innerHTML += days + ' dag' + dps + ' ';
				document.all.countdown.innerHTML += hours + ' uur' + hps + ' ';
				document.all.countdown.innerHTML += minutes + ' minuten' + mps + ' en ';
				document.all.countdown.innerHTML += seconds + ' seconde' + sps;
                document.all.countdown.innerHTML += ' tot het Slotconcert 2010!';
			break;
			default:
				document.all.countdown.innerHTML = Time_Left + ' seconden';
		}
	}

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