var req;

$(document).ready(function() {
	$("body").attr("onload", "navigate('','')");	
});

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

function callback() {        
	obj = document.getElementById("calendar");
	setFade(0);
        
	if(obj != undefined && req.readyState == 4) {
                if(req.status == 200) {
                        response = req.responseText;
                        obj.innerHTML = response;
                        fade(0);
                } else {
                        alert("There was a problem retrieving the data:\n" + req.statusText);
                }
        }
}

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;
	
	if(obj != undefined)
	{
		// 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;
	}
}