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);

Today = new Date();
Todays_Year = Today.getFullYear() - 2000;
Todays_Month = Today.getMonth();


//Computes the time difference between the client computer and the server.
Server_Date = (new Date(12, 2, 6,
					 23, 43, 2)).getTime();
Todays_Date = (new Date(Todays_Year, Todays_Month, Today.getDate(),
					 Today.getHours(), Today.getMinutes(), Today.getSeconds())).getTime();

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

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

//Convert 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.
//Taking into account the time differential between the client computer and the server.
Time_Left = Math.round((Target_Date - Todays_Date + time_difference) / 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 = ''; hps = ''; mps = ''; sps = '';
		//ps is short for plural suffix.
		if(days == 1) dps ='';
		if(hours == 1) hps ='';
		if(minutes == 1) mps ='';
		if(seconds == 1) sps ='';
		if (hours < 10) hours = '0'+hours;
		if (minutes < 10) minutes = '0'+minutes;
		if (seconds < 10) seconds = '0'+seconds;
		days = days-36525;
		document.all.countdown.innerHTML = 'Még ' + days + ' nap' + dps + ' ';
		document.all.countdown.innerHTML += hours + ':' + hps;
		document.all.countdown.innerHTML += minutes + ':' + mps;
		document.all.countdown.innerHTML += seconds + sps + '<img src="images/visszaszamlalo.gif" width="23" height="11" /> az indulásig&nbsp;';
		
	break;
   default:
		document.all.countdown.innerHTML = Time_Left + ' seconds';
   }

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