var req;

function navigate(month,year,evt) {
	setFade(0);
	var url = "_includes/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, maand, jaar) {
	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="datum">\n';
	var months = new Array('januari','februari','maart','april','mei','juni','juli','augustus','september','oktober','november','december');
	var n;
	for(var i=0;i<12;i++) {
		n = maand + i;
		if (n > 12) {
			n -= 12;
		}
		if (n < 10) {
			n = '0' + n;
		}
		if (maand + i < 13) {
			output += '<option value="'+n+'-'+jaar+'">'+months[(maand+i-1)]+' '+jaar+'</option>\n';
		} else {
			output += '<option value="'+n+'-'+(jaar+1)+'">'+months[(maand+i-13)]+' '+(jaar+1)+'</option>\n';
		}
	}
	output += '</select> <a href="javascript:jumpTo()"><img src="_img/calGo.gif" alt="go" /></a> <a href="javascript:hideJump()"><img src="_img/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,''); */
	var datum = getObject("datum");
	navigate(datum.options[datum.selectedIndex].value.substr(0,2),datum.options[datum.selectedIndex].value.substr(3,4),'');
	// hideJump();
}