var xmlHttp;
var clicked='false';

function hoverShowConcert(year, month, day)
{ 
	if (clicked=='true')
		return;
		
	xmlHttp=GetXmlHttpObject();
	if (xmlHttp==null)
	{
		alert ("Your browser does not support AJAX!");
		return;
	} 
	var url="getCalendarConcert.php";
	url=url+"?year="+year;
	url=url+"&month="+month;
	url=url+"&day="+day;
	xmlHttp.onreadystatechange=stateChanged;
	xmlHttp.open("GET",url,true);
	xmlHttp.send(null);
}

function clickshowConcert(year, month, day)
{ 
	if (clicked=='false')
		clicked='true';
		
	xmlHttp=GetXmlHttpObject();
	if (xmlHttp==null)
	{
		alert ("Your browser does not support AJAX!");
		return;
	} 
	var url="getCalendarConcert.php";
	url=url+"?year="+year;
	url=url+"&month="+month;
	url=url+"&day="+day;
	xmlHttp.onreadystatechange=stateChanged;
	xmlHttp.open("GET",url,true);
	xmlHttp.send(null);
}

function showCalendarLinks(year, month)
{
	xmlHttp=GetXmlHttpObject();
	if (xmlHttp==null)
	{
		alert ("Your browser does not support AJAX!");
		return;
	} 
	
	var url="getCalendarLinks.php";
	if (year)
		url=url+"?year="+year;
	if (month)		
		url=url+"&month="+month;
	xmlHttp.onreadystatechange=stateChanged2;
	xmlHttp.open("GET",url,true);
	xmlHttp.send(null);
}

function stateChanged() 
{ 
	if (xmlHttp.readyState==4)
	{ 
		document.getElementById('calendar-concert-holder').innerHTML=xmlHttp.responseText;
	}
}

function stateChanged2()
{
	if (xmlHttp.readyState==4)
	{ 
		document.getElementById('calendar').innerHTML=xmlHttp.responseText;
	}
}

function GetXmlHttpObject()
{
	var xmlHttp=null;
	try
	{
		// Firefox, Opera 8.0+, Safari
		xmlHttp=new XMLHttpRequest();
	}
	catch (e)
	{
		// Internet Explorer
		try
		{
			xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
		}
		catch (e)
		{
			xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
		}
	}
	return xmlHttp;
}