var last_id=0;
	var last_object_style="";
	
	function select_item(act_object)
	{
		//alert( last_id);
		if (!act_object.id || act_object.id == last_id) return;
		if (last_id != 0 )
		{	
			last_object=document.getElementById(last_id);
			last_object.style.backgroundColor=last_object_style;
		}
		last_id = act_object.id;
		last_object_style=act_object.style.backgroundColor;
		act_object.style.backgroundColor="Orange";
	}
	
	function add_day(day, days)
	{
		var days = parseInt(days);
		var futdate = new Date()
		var expdate = day.getTime();
		expdate = expdate + (days * 24 * 3600 * 1000);
		futdate.setTime(expdate)
		//dt = new Date(day.getYear(),day.getMonth(),day.getDate() + days );
		//alert(day.getYear() +',' + day.getMonth() +',' + day.getDate() +',' + days + ' ' + dt.toLocaleDateString());
		return futdate;
	}
	
	function getCzDayOfWeek(dayOfWeek)
	{
		czdny = ["Ne.","Pon.","Út.","St.","Čt.","Pá.","So.","Ne."];
		return czdny[dayOfWeek];
	}
	
	function dateToCZstring(day)
	{
		czdny = ["Ne.","Pon.","Ut.","St.","Ct.","Pa.","So.","Ne."];
		num = day.getDay();
		str_date = czdny[num] + ' ' + day.getDate() + '. ' + (day.getMonth()+1) +'. ' +  day.getFullYear();
		return str_date;
	}
	
	function showElement(element)
	{
		document.getElementById( element ).style.display = "";
	}
	
	function hideElement(element)
	{
		document.getElementById( element ).style.display = "none";
	}