var req;

function navigate(month,year,evt) {
        setFade(0);
        var url = "/super_calendar.php?month="+month+"&year="+year+"&event="+evt;
        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");
                getObject("calendar").innerHTML = resp[0].getElementsByTagName("content")[0].childNodes[0].nodeValue;
                fade(70);
        }
}

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

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

function setFade(amt) {
        var obj = getObject("calendar");
        amt = (amt == 100)?99.999:amt;
        obj.style.filter = "alpha(opacity:"+amt+")";
        obj.style.KHTMLOpacity = amt/100;
        obj.style.MozOpacity = amt/100;
        obj.style.opacity = amt/100;
}

function showJump(obj) {
        var curleft = curtop = 0;
        if (obj.offsetParent) {
                curleft = obj.offsetLeft
                curtop = obj.offsetTop
                while (obj = obj.offsetParent) {
                        curleft += obj.offsetLeft
                        curtop += obj.offsetTop
                }
        }
        var jump = document.createElement("div");
        jump.setAttribute("id","jump");
        jump.style.position = "absolute";
        jump.style.top = curtop+15+"px";
        jump.style.left = curleft+"px";
        var output = '<select id="month">\n';
        var months = new Array('January','February','March','April','May','June','July','August','September','October','November','December');
        var n;
        for(var i=0;i<12;i++) {
                n = ((i+1)<10)? '0'+(i+1):i+1;
                output += '<option value="'+n+'">'+months[i]+'  </option>\n';
        }
        output += '</select> \n<select id="year">\n';
        for(var i=0;i<=15;i++) {
                n = (i<10)? '0'+i:i;
                output += '<option value="20'+n+'">20'+n+'  </option>\n';
        }
        output += '</select> <a href="javascript:jumpTo()"><img src="/images/calGo.gif" alt="go" /></a> <a href="javascript:hideJump()"><img src="/images/calStop.gif" alt="close" /></a>';
        jump.innerHTML = output;
        document.body.appendChild(jump);
}

function hideJump() {
        document.body.removeChild(getObject("jump"));   
}

function jumpTo() {
        var m = getObject("month");
        var y = getObject("year");
        navigate(m.options[m.selectedIndex].value,y.options[y.selectedIndex].value,'');
        hideJump();
}