function checkForm(contactForm)
{

 if (contactForm.Nachname.value == "")
  {
    alert("Geben Sie einen Wert in das Feld \"Nachname\" ein.");
    contactForm.Nachname.focus();
    return (false);
  }

  if (contactForm.Strasse.value == "")
  {
    alert("Geben Sie einen Wert in das Feld \"Straße\" ein.");
    contactForm.Strasse.focus();
    return (false);
  }

  if (contactForm.PLZ_Ort.value == "")
  {
    alert("Geben Sie einen Wert in das Feld \"Plz-Ort\" ein.");
    contactForm.PLZ_Ort.focus();
    return (false);
  }

  if (contactForm.Land.value == "")
  {
    alert("Geben Sie einen Wert in das Feld \"Land\" ein.");
    contactForm.Land.focus();
    return (false);
  }

  if (contactForm.Mail.value == "")
  {
    alert("Geben Sie einen Wert in das Feld \"E-Mail\" ein.");
    contactForm.Mail.focus();
    return (false);
  }

}

function checkFormIt(contactForm)
{

  if (contactForm.Cognome.value == "")
  {
    alert("Prego inserire il cognome.");
    contactForm.Cognome.focus();
    return (false);
  }

  if (contactForm.Via.value == "")
  {
    alert("Prego inserire l'indirizzo.");
    contactForm.Via.focus();
    return (false);
  }

  if (contactForm.CAP_Localita.value == "")
  {
    alert("Prego inserire la località.");
    contactForm.CAP_Localita.focus();
    return (false);
  }

  if (contactForm.Paese.value == "")
  {
    alert("Prego inserire il paese.");
    contactForm.Paese.focus();
    return (false);
  }

  if (contactForm.Mail.value == "")
  {
    alert("Prego inserire l'indirizzo e-mail.");
    contactForm.Mail.focus();
    return (false);
  }

}

function checkFormEn(contactForm)
{

  if (contactForm.Surname.value == "")
  {
    alert("Please insert your surname.");
    contactForm.Surname.focus();
    return (false);
  }

  if (contactForm.Street.value == "")
  {
    alert("Please insert your address.");
    contactForm.Street.focus();
    return (false);
  }

  if (contactForm.Postcode_Town.value == "")
  {
    alert("Please insert the town.");
    contactForm.Postcode_Town.focus();
    return (false);
  }

  if (contactForm.Country.value == "")
  {
    alert("Please insert the country.");
    contactForm.Country.focus();
    return (false);
  }

  if (contactForm.Mail.value == "")
  {
    alert("Please insert your e-mail.");
    contactForm.Mail.focus();
    return (false);
  }

}