function loeschen2(form)
{
  if (form.search_exp.value == "")
  {
    form.search_exp.value = "Suchbegriff ?";
  }
  else
  {
    if (form.search_exp.value == "Suchbegriff ?")
    {
      form.search_exp.value = "";
    }
  }
}

function aktualisieren(form)
{
  if (form.search_exp.value == "")
  {
    form.search_exp.value = "Suchbegriff ?";
  }
}