/* Code from w3schools.com - modified for the purposes of this website */

var xmlHttp;

function showEvents(str)
{ 
	xmlHttp=GetXmlHttpObject();
	if (xmlHttp==null)
	{
		alert ("Browser does not support HTTP Request");
		return;
	}

	var url="queryyear.php";
	url=url+"?year="+str;
	url=url+"&sid="+Math.random();
	xmlHttp.onreadystatechange=stateChanged; 
	xmlHttp.open("GET",url,true);
	xmlHttp.send(null);
}

function showTypes(str)
{
	xmlHttp=GetXmlHttpObject();
	if (xmlHttp==null)
	{
		alert ("Browser does not support HTTP Request");
		return;
	}

	var url="querytype.php";
	url=url+"?type="+str;
	url=url+"&sid="+Math.random();
	xmlHttp.onreadystatechange=stateChanged; 
	xmlHttp.open("GET",url,true);
	xmlHttp.send(null);
}

function stateChanged() 
{ 
	if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
 	{ 
 		document.getElementById("divmain").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;
}