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 ='';
	    
	    document.all.countdown.innerHTML = days + ' day' + dps + ' ';
	    document.all.countdown.innerHTML += hours + ' hr' + hps + ' ';
	    document.all.countdown.innerHTML += minutes + ' min' + mps + ' ';
	    document.all.countdown.innerHTML += seconds + ' sec' + sps;
	    break;
	default: 
	    document.all.countdown.innerHTML = Time_Left + ' seconds';
	} //switch
	     
	//Recursive call, keeps the clock ticking.
	setTimeout('countdown(' + year + ',' + month + ',' + day + ',' + hour + ',' + minute + ',' + format + ');', 1000);
}