function thema(Thema)
{ document.write('<br>');
  document.write('<hr width="400">');
  document.write('<div style="font-size:16pt; color:#999999; text-align:center;">'+ Thema +'</div>');
  document.write('<hr width="400">');
  document.write('<br>');
  document.write('<br>');
}