function show_date(id_name){
  var weekdays = new Array("Sonntag","Montag","Dienstag","Mittwoch","Donnerstag","Freitag","Samstag");
  var months =new Array("Januar","Februar","März","April","Mai","Juni","Juli","August","September","Oktober","November","Dezember");
  var now=new Date();
  var day=now.getDate();
  var month=now.getMonth();
  var year=now.getFullYear();
  var weekday=now.getDay();
  var day0=((day<10) ? "0" : "");
  var month0=((month<10) ? ".0" : ".");
  var today = day0 + day + ". " + months[month] + " " + year;
  var date_to_show=weekdays[weekday] + ", " + today;
  document.getElementById(id_name).innerHTML=date_to_show;
}