function xmlreq()
{
	var req = null;
	try{
		req = new XMLHttpRequest();
	}
	catch (e){
		try{
			req = new ActiveXObject("Msxml2.XMLHTTP");
		}
		catch (e){
			try{
				req = new ActiveXObject("Microsoft.XMLHTTP");
			}
			catch (failed){
				req = null;
			}
		}
	}
	if (req == null)
		alert("Error creating request object!");
	return(req);
}

function cal_get(mon, year) {
	mon = (mon == null) ? 0 : mon;
	year = (year == null) ? 0 : year;
	var obj = document.getElementById('calendar_box');

	obj.innerHTML = '<img src="http://sfg-singen.de/template_markus/wait_small.gif"><br>Bitte warten';
	var req = xmlreq();
	req.open("GET", 'http://sfg-singen.de/ajax/ajax_cal_get.php?mon='+mon+'&year='+year, true);
	req.onreadystatechange = function(){
		switch(req.readyState) {
			case 4:
				if(req.status!=200) {
					//alert("Fehler:"+req.status);
				} else {
					obj.innerHTML = req.responseText;
				}
			break;

			default:
				return false;
			break;
		}
	}
	req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
	req.send(null);
}

function nextdates_get() {
	var obj = document.getElementById('nextdates_box');

	obj.innerHTML = '<img src="http://sfg-singen.de/template_markus/wait_small.gif"><br>Bitte warten';
	var req = xmlreq();
	req.open("GET", 'http://sfg-singen.de/ajax/ajax_nextdates_get.php', true);
	req.onreadystatechange = function(){
		switch(req.readyState) {
			case 4:
				if(req.status!=200) {
					//alert("Fehler:"+req.status);
				} else {
					var xml = req.responseXML;
					obj.innerHTML = resp(xml, "content");
				}
			break;

			default:
				return false;
			break;
		}
	}
	req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
	req.send(null);
}

function date_show(uday) {
	var datebox = document.getElementById('datebox');
	var darkbg = document.getElementById('dark_bg');
	darkbg.onclick = function () { date_close(); }
	dgb_fin();
	date_load(uday);
	location.hash = '#date';
}

function date_load(uday) {
	var datebox = document.getElementById('datebox');

	datebox.innerHTML = '<img src="http://sfg-singen.de/template_markus/wait.gif">';
	datebox.style.display = 'block';

	var req = xmlreq();
	req.open("GET", 'http://sfg-singen.de/ajax/ajax_date_get.php?uday='+uday, true);
	req.onreadystatechange = function(){
		switch(req.readyState) {
			case 4:
				if(req.status!=200) {
					//alert("Fehler:"+req.status+"\n"+req.responseText);
				} else {
					var xml = req.responseXML;
					datebox.innerHTML = resp(xml, "content");
				}
			break;

			default:
				return false;
			break;
		}
	}
	req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
	req.send(null);
}

function date_close() {
	var datebox = document.getElementById('datebox');
	dgb_fout();
	datebox.style.display = 'none';
}

function date_interact(what, did, uday) {
		var req = xmlreq();
		
		parameters = "what="+what+"&did="+did+"&ctext="+escape(encodeURI(document.getElementById('c'+did+'ctext').value));
		
		req.open("POST", 'http://sfg-singen.de/ajax/ajax_date_interact.php', true);
		req.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
		req.setRequestHeader("Content-length", parameters.length);
		req.setRequestHeader("Connection", "close");
		req.send(parameters);
		
		req.onreadystatechange = function(){ //<-- anonyme funktion
			switch(req.readyState) {
				case 4:
					if(req.status!=200) {
						//alert("Fehler:"+req.status); 
					}else{
						if(req.responseText.length > 0) {
							document.getElementById('c'+did+'return').innerHTML = req.responseText;
						} else {
							date_load(uday);
							nextdates_get();
						}
					}
				break;
			
				default:
					return false;
				break;
			}
		};
}

function comment_onfocus(did) {
	var otext = document.getElementById('c'+did+'ctext');
	if(otext.value != "Kommentar schreiben") return false;
	otext.style.height = '30px';
	document.getElementById('c'+did+'celems').style.display = 'inline';
	otext.value = '';
}