function checkForm(fm)
{
  
  if (fm.Vorname.value == "")
  {
    alert("Please insert your Name !");
    fm.Vorname.focus();
    return (false);
  }
  
  if (fm.Zuname.value == '')
  {
    alert("Please insert your Surname !")
    fm.Zuname.focus()
    return (false);
  }

      
  if (fm.EMail.value == '')
  {
    alert("Please insert your e-mail !");
    fm.EMail.focus();
    return (false);
  }


  if (fm.EMail.value.indexOf('@') == -1)
  {
  alert("Error ! Wrong e-mail !");
  fm.EMail.focus();
  return (false);
  }

  }