var myRequest = null;

function CreateXmlHttpReq(handler) {
  var xmlhttp = null;
  try {
    xmlhttp = new XMLHttpRequest();
  } catch(e) {
    try {
        xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
    } catch(e) {
        xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
    }
  }
  xmlhttp.onreadystatechange = handler;
  return xmlhttp;
}
function updateCalendarHandler() {
	var e = document.getElementById("calendar");
    if (myRequest.readyState == 4 && myRequest.status == 200) {
		var response=myRequest.responseText;
		e.innerHTML=response;
	}
}

function updateCalendar(l,m,y) {
    myRequest = CreateXmlHttpReq(updateCalendarHandler);
    myRequest.open("GET","loadcal.php?l="+l+"&m="+m+"&y="+y);
    myRequest.send(null);
    return false;
}