function calendar(){
			win = window.open('http://www.networking.ch/clients/seefeld/calendar/login.php', 'Fenster',
			'top=10,left=10,scrollbars=no,resizable=yes,location=no,directories=no,copyhistory=no,menubar=no,status=no,toolbar=no,width=800,height=700');
			//if (parseInt(navigator.appVersion) >= 4) { win.window.focus(); }
		}