var req;

function navigate(month, year){
	
	var url = "calendar/calendar.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");
	wt  = document.getElementById("waiting");
	setFade(0);
	if(req.readyState == 4) {
		if(req.status == 200) {
			response = req.responseText;
			obj.innerHTML = response;
			fade(0);
			wt.style.display = 'none';
		} else {
			
		}
	}else{
		wt.style.display = 'block';
	}
}

function fade(amt) {
	if(amt <= 100) {
		setFade(amt);
		amt += 10;
		setTimeout("fade("+amt+")", 5);
    }
}

function setFade(amt) {
	obj = document.getElementById("calendar");
	amt = (amt == 100)?99.999:amt;
	// IE
	obj.style.filter = "alpha(opacity:"+amt+")";
	// Safari<1.2, Konqueror
	obj.style.KHTMLOpacity = amt/100;
	// Mozilla and Firefox
	obj.style.MozOpacity = amt/100;
	// Safari 1.2, newer Firefox and Mozilla, CSS3
	obj.style.opacity = amt/100;
}