var javascript_countdown = function () {
	var time_left = 10; //number of seconds for countdown
// 	var output_element_id = 'javascript_countdown_time';
	var keep_counting = 1;
	var no_time_left_message = 'Akce vypršela!';

	function countdown() {
		if(time_left < 2) {
			keep_counting = 0;
		}

		time_left = time_left - 1;
	}

	function add_leading_zero(n) {
		if(n.toString().length < 2) {
			return '0' + n;
		} else {
			return n;
		}
	}

	function format_output() {
		var hours, minutes, seconds, dot;

		seconds = time_left % 60;
		minutes = Math.floor(time_left / 60) % 60;
		hours = Math.floor(time_left / 3600);
 
		seconds = add_leading_zero( seconds );
		minutes = add_leading_zero( minutes );
		hours = add_leading_zero( hours );

		return '<span class="time_item">' + hours + '<span class="small"></span></span><span class="dot">:</span>' + 
           '<span class="time_item">' + minutes + '<span class="small"></span></span><span class="dot">:</span>' + 
           '<span class="time_item last">' + seconds + '<span class="small"></span></span>';
	}

	function show_time_left() {
		document.getElementById(output_element_id).innerHTML = format_output();//time_left;
	}

	function no_time_left() {
		document.getElementById(output_element_id).innerHTML = no_time_left_message;
	}

	return {
		count: function () {
			countdown();
			show_time_left();
		},
		timer: function () {
			javascript_countdown.count();
 
			if(keep_counting) {
				setTimeout("javascript_countdown.timer();", 1000);
			} else {
				no_time_left();
			}
		},

		init: function (t, element_id) {
			time_left = t;
			output_element_id = element_id;
			javascript_countdown.timer();
		}
	};
}();