var req;

function navigate(month,year,timezone,webinarid,onlyfromcategory) {

    if (month === '0' || year === '0') {
        var url = "/webinar/super_calendar.php?timezone="+timezone+"&webinarid="+webinarid+"&onlyfromcategory="+onlyfromcategory;
    } else {
        var url = "/webinar/super_calendar.php?month=" + month + "&year=" + year + "&timezone="+timezone+"&webinarid="+webinarid+"&onlyfromcategory="+onlyfromcategory;
    }
	
	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() {

	if(req.readyState == 4) {
		var response = req.responseXML;
		var resp = response.getElementsByTagName("response");

		cal = resp[0].getElementsByTagName("content")[0].childNodes[0].nodeValue;

		webinardesc = "";

		if(cal == "bad")
		{
			cal = "";
			getObject("timezonediv").style.visibility = "hidden";
		}
		else
		{
			webinardesc =  resp[0].getElementsByTagName("webinardescription")[0].childNodes[0].nodeValue;
			getObject("timezonediv").style.visibility = "visible";
		}

		getObject("calendar").innerHTML = cal;
		getObject("webinardescription").innerHTML = webinardesc;


	}
}

function getWebinars(categoryid) {
	var url = "/webinar/super_calendar.php?categoryid=" + categoryid;
	if(window.XMLHttpRequest) {
		req = new XMLHttpRequest();
	} else if(window.ActiveXObject) {
		req = new ActiveXObject("Microsoft.XMLHTTP");
	}

	req.open("GET", url, true);
	req.onreadystatechange = changeWebinars;
	req.send(null);

}

function changeWebinars() {

	if(req.readyState == 4) {

		var response = req.responseXML;
		var resp = response.getElementsByTagName("response");
		getObject("currentcategorywebinars").innerHTML=resp[0].getElementsByTagName("webinars")[0].childNodes[0].nodeValue;
		getObject("categorydescription").innerHTML=resp[0].getElementsByTagName("categorydescription")[0].childNodes[0].nodeValue;
		updateTimezone();
	}
}

function getObject(obj) {
	var o;
	if(document.getElementById) o = document.getElementById(obj);
	else if(document.all) o = document.all.obj;
	return o;
}