var req;

function navigate(month,year) {
        var url = "ajax_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");
        setFade(0);
        
		if(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 show_full_text(text , color)
{
	//pos_x = event.offsetX?(event.offsetX):event.pageX;
    //pos_y = event.offsetY?(event.offsetY):event.pageY;

	divObj = document.getElementById("info");
	divObj.innerHTML = "<div style='background-color:"+color+"; width:100%;'><strong>" + text + "</strong></div>";
	//divObj.style.top = (pos_y - 20);
	//divObj.style.left = pos_x;	
	divObj.style.visibility = "visible";
	
}
function hide_full_text()
{
	divObj = document.getElementById("info");
	divObj.style.visibility = "hidden";
}

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;
}