function navigate(month,year) {
        var url = "/cal.php?month="+month+"&year="+year;
        if(window.XMLHttpRequest) {
                req = new XMLHttpRequest();
        } else if(window.ActiveXObject) {
                req = new ActiveXObject("Microsoft.XMLHTTP");
        }
        req.open("GET", url, true);
        req.onreadystatechange = callback;
        req.send(null);
}

function callback() {
        obj = document.getElementById("calendar");

		if(req.readyState == 4) {
                if(req.status == 200) {
                        response = req.responseText;
                        obj.innerHTML = response;
                        //fade(0);
                } 
// added by dwinanto
			//else {
                        //alert("Arigato Gozaimatsu:\n" + req.statusText);
                	//}
        }
}