function countdown(year, month, day, hour, minute, area_id) {
	Today = new Date();
	Todays_Year = Today.getFullYear() - 2000;
	Todays_Month = Today.getMonth();                  
	
	//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 - 1, 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;
		$('semaforo'+area_id).src = 'images/LIGHT-go-A.jpg';
	}
	
	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;
	
	$('gg'+area_id).innerHTML = days;
	$('ore'+area_id).innerHTML = hours;
	$('min'+area_id).innerHTML = minutes;
	$('sec'+area_id).innerHTML = seconds;
	
	//Recursive call, keeps the clock ticking.
	setTimeout('countdown(' + year + ',' + month + ',' + day + ',' + hour + ',' + minute + ',' + area_id + ');', 1000);
}