function kalender(showdate,action,actiondate) {
	var http = false;
	
	if(navigator.appName == "Microsoft Internet Explorer") {
	  http = new ActiveXObject("Microsoft.XMLHTTP");
	} else {
	  http = new XMLHttpRequest();
	}
	
	http.open('GET', 'http://www.jolly-joker.de/kalender.php?showdate=' + showdate + '&action=' + action + '&actiondate=' + actiondate);
	http.onreadystatechange=function() {
	  if(http.readyState == 4) {
		document.getElementById('kalender').innerHTML = http.responseText;
	  }
	}
	http.send(null);
}