function sidecalRefresh (year, month)
{
	var sidecalReq;
	try{ // Opera, Firefox, Safari
		sidecalReq = new XMLHttpRequest();
	}catch(e){
		try{ //Internet Explorer
		sidecalReq = new ActiveXObject("Msxml2.XMLHTTP");
		}catch(e){
			try{ //Other
			sidecalReq = new ActiveXObject("Microsoft.XMLHTTP");
			}catch(e){
				return false;
			}
		}
	}
		
	sidecalReq.onreadystatechange = function (){
		if(sidecalReq.readyState == 4){
			document.getElementById("side_calendar").innerHTML = sidecalReq.responseText;
		}
	}
	
	sidecalReq.open ("GET", "scripts/calendar/calendar.php?year=" + year + "&month=" + month, true);
	sidecalReq.send (null);
}