//var seconds_left = X;

function count_down() {
	var txtDays = "";
	var txtHours = "";
	var txtMinutes = "";
	var txtSeconds = "";

	if(seconds_left > 1) {
		--seconds_left;

		var dummy = seconds_left;

		var days = Math.floor(dummy / (24 * 60 * 60));
		var hours = Math.floor((dummy - (days * (24 * 60 * 60))) / (60 * 60));
		var minutes = Math.floor((dummy - (days * (24 * 60 * 60)) - (hours * (60 * 60))) / 60);
		var seconds = dummy - (days * (24 * 60 * 60)) - (hours * 60 * 60) - (minutes * 60);

		var text = "Bivak Arendonk: nog ";

		if(days > 1) {
			txtDays = days + " dagen, ";
			text += txtDays;
		} else if(days == 1) {
			txtDays = days + " dag, ";
			text += txtDays;
		} else {
			txtDays = "";
		}

		if(hours > 1) {
			txtHours = hours + " uren, ";
			text += txtHours;
		} else if(hours == 1) {
			txtHours = hours + " uur, ";
			text += txtHours;
		} else {
			if(days > 0) {
				txtHours = "0 uur, ";
				text += txtHours;
			} else {
				txtHours = "";
			}
		}

		if(minutes > 1) {
			txtMinutes = minutes + " minuten en ";
			text += txtMinutes;
		} else if(minutes == 1) {
			txtMinutes = minutes + " minuut en ";
			text += txtMinutes;
		} else {
			if(hours > 0 || days > 0) {
				txtMinutes = "0 minuten en ";
				text += txtMinutes;
			} else {
				txtMinutes = "";
			}
		}

		if(seconds > 1) {
			txtSeconds = seconds + " seconden.";
			text += txtSeconds;
		} else if(seconds == 1) {
			txtSeconds = seconds + " seconde.";
			text += txtSeconds;
		} else {
			if(minutes >= 0 || hours >= 0 || days >= 0) {
				txtSeconds = "0 seconden.";
				text += txtSeconds;
			} else {
				txtSeconds = "";
			}
		}

		setTimeout("count_down()", 1000);
	} else {
		text = "Wij zijn op bivak!";
		text = "";
	}

	document.getElementById("countdown").innerHTML = text;
}