function checkEingabe()
  {
    if (document.myform.login.value == "")
    {
      alert("Please enter your Login.");
      document.myform.login.focus();
      return false;
    }
      if (document.myform.passwort.value == "")
    {
      alert("Please enter your Password.");
      document.myform.passwort.focus();
      return false;
    }
      return true;
  } // checkEingabe