var xmlHttp;

function getCalendar(mo, yr) {
	if (mo.length==0 || yr.length==0) { 
		document.getElementById("ajaxCal").innerHTML="";
		return;
	}
	
	xmlHttp=GetXmlHttpObject();
	
	if (xmlHttp==null) {
		alert ("Your browser does not support AJAX! The RHEP/AHEC Calendar of events cannot be displayed.");
		return;
	}
	
	var url="_ajax/ajax_calendar.asp";
	url=url+"?Month="+mo;
	url=url+"&Year="+yr;
	url=url+"&sid="+Math.random();
	xmlHttp.onreadystatechange=stateChanged;
	xmlHttp.open("GET",url,true);
	xmlHttp.send(null);
} 

function stateChanged() { 
	// alert("Ready state: " + xmlHttp.readyState);
	if (xmlHttp.readyState==4) { 
		document.getElementById("ajaxCal").innerHTML=xmlHttp.responseText;
	}
}
function GetXmlHttpObject() {
	var xmlHttp=null;
	try {
		// Firefox, Opera 8.0+, Safari
		// alert("try: XMLHttpRequest");
		xmlHttp=new XMLHttpRequest();
	} catch (e) {
		// Internet Explorer
		try {
			// alert("failed: XMLHttpRequest");
			xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
			// alert("try: msxml2");
		} catch (e) {
			// alert("failed: msxml2");
			xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
			// alert("try: microsoft.xmlhttp");
		}
	}
	return xmlHttp;
}