var xmlHttp

function show_pelajaran(jenjang)
{
	if (jenjang.length==0)
	{
		document.getElementById("mapel").innerHTML="";
		return;
	}
	
	xmlHttp=GetXmlHttpObject()
	if (xmlHttp==null)
	{
		alert ("Your browser does not support AJAX!");
		return;
	}
	
	//var url="select.php";
	//url=url+"?jenjang="+jenjang;
	//url=url+"&sid="+Math.random();
	
	var url="select.php?jenjang="+jenjang+"&sid="+Math.random();		
	xmlHttp.onreadystatechange=stateChanged;
	xmlHttp.open("GET",url,true);
	xmlHttp.send(null);
}

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