function controllo_form(theForm)
{
  if (theForm.realname.value== "")
  {
    alert("Einsetzen Ihre Name bitte!!");
    theForm.realname.focus();
    return (false);
  }
  var checkOK = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyzƒŠŒŽšœžŸÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõöøùúûüýþÿ \t\r\n\f";
  var checkStr = theForm.realname.value;
  var allValid = true;
  for (i = 0;  i < checkStr.length;  i++)
  {
    ch = checkStr.charAt(i);
    for (j = 0;  j < checkOK.length;  j++)
      if (ch == checkOK.charAt(j))
        break;
    if (j == checkOK.length)
    {
      allValid = false;
      break;
    }
  }
  if (!allValid)
  {
    alert("Einsetzen nur Buchstaben in Feld \"Name\".");
    theForm.realname.select();
    return (false);
  }
  if (theForm.cognome.value== "")
  {
    alert("Einsetzen Ihre Vorname!!");
    theForm.cognome.focus();
    return (false);
  }
  var checkOK = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyzƒŠŒŽšœžŸÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõöøùúûüýþÿ- \t\r\n\f";
  var checkStr = theForm.cognome.value;
  var allValid = true;
  for (i = 0;  i < checkStr.length;  i++)
  {
    ch = checkStr.charAt(i);
    for (j = 0;  j < checkOK.length;  j++)
      if (ch == checkOK.charAt(j))
        break;
    if (j == checkOK.length)
    {
      allValid = false;
      break;
    }
  }
  if (!allValid)
  {
    alert("Einsetzen nur Buchstaben in Feld \"Vorname\".");
    theForm.cognome.focus();
    return (false);
  }
  if (theForm.giorno_arrivo.selectedIndex == 0)
  {
    alert("Wählen Sie bitte ein Ankunft Tage!!");
    theForm.giorno_arrivo.focus();
    return (false);
  }
  if (theForm.mese_arrivo.selectedIndex == 0)
  {
    alert("Wählen Sie bitte ein Ankunft Monat!!");
    theForm.mese_arrivo.focus();
    return (false);
  }
  if (theForm.giorno_partenza.selectedIndex == 0)
  {
    alert("Wählen Sie bitte ein Abfahrt Tage!!");
    theForm.giorno_partenza.focus();
    return (false);
  }
  if (theForm.mese_partenza.selectedIndex == 0)
  {
    alert("Wählen Sie bitte ein Abfahrt Monat!!");
    theForm.mese_partenza.focus();
    return (false);
  }
  if (theForm.N_persone.value== "")
  {
    alert("Einsetzen Personen Nummer!!");
    theForm.N_persone.focus();
    return (false);
  }
  var checkOK = "0123456789";
  var checkStr = theForm.N_persone.value;
  var allValid = true;
  for (i = 0;  i < checkStr.length;  i++)
  {
    ch = checkStr.charAt(i);
    for (j = 0;  j < checkOK.length;  j++)
      if (ch == checkOK.charAt(j))
        break;
    if (j == checkOK.length)
    {
      allValid = false;
      break;
    }
  }
  if (!allValid)
  {
    alert("Einsetzen nur numerische Buchstaben in Feld \"N° Personen\".");
    theForm.N_persone.focus();
    return (false);
  }
  if (theForm.N_persone.value.length > 2)
  {
    alert("Einsetzen ein kleiner Nummer in Feld \"N° Personen\"!");
    theForm.N_persone.select();
    return (false);
  }
  if (theForm.email.value== "")
  {
    alert("Einsetzen Ihre E-mail!!");
    theForm.email.focus();
    return (false);
  }
  var checkOK = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyzƒŠŒŽšœžŸÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõöøùúûüýþÿ0123456789@.- \t\r\n\f";
  var checkStr = theForm.email.value;
  var allValid = true;
  for (i = 0;  i < checkStr.length;  i++)
  {
    ch = checkStr.charAt(i);
    for (j = 0;  j < checkOK.length;  j++)
      if (ch == checkOK.charAt(j))
        break;
    if (j == checkOK.length)
    {
      allValid = false;
      break;
    }
  }
  if (!allValid)
  {
    alert("Einsetzen nur Buchstaben und numerische Buchstaben in Feld \"E-mail:\".");
    theForm.email.focus();
    return (false);
  }
  if (theForm.telefono.value== "")
  {
    alert("Einsetzen Ihre Telephonnummer!!");
    theForm.telefono.focus();
    return (false);
  }
  var checkOK = "0123456789./";
  var checkStr = theForm.telefono.value;
  var allValid = true;
  for (i = 0;  i < checkStr.length;  i++)
  {
    ch = checkStr.charAt(i);
    for (j = 0;  j < checkOK.length;  j++)
      if (ch == checkOK.charAt(j))
        break;
    if (j == checkOK.length)
    {
      allValid = false;
      break;
    }  
	}
  if (!allValid)
  {
    alert("Einsetzen nur numerische Buchstaben in Feld \"Telephon:\".");
    theForm.telefono.focus();
    return (false);
  }
  var checkOK = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyzƒŠŒŽšœžŸÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõöøùúûüýþÿ- \t\r\n\f";
  var checkStr = theForm.citta.value;
  var allValid = true;
  for (i = 0;  i < checkStr.length;  i++)
  {
    ch = checkStr.charAt(i);
    for (j = 0;  j < checkOK.length;  j++)
      if (ch == checkOK.charAt(j))
        break;
    if (j == checkOK.length)
    {
      allValid = false;
      break;
    }
  }
  if (!allValid)
  {
    alert("Einsetzen nur Buchstaben in Feld \"Stadt:\".");
    theForm.citta.focus();
    return (false);
  }
  var checkOK = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz ";
  var checkStr = theForm.stato.value;
  var allValid = true;
  for (i = 0;  i < checkStr.length;  i++)
  {
    ch = checkStr.charAt(i);
    for (j = 0;  j < checkOK.length;  j++)
      if (ch == checkOK.charAt(j))
        break;
    if (j == checkOK.length)
    {
      allValid = false;
      break;
    }
  }
  if (!allValid)
  {
    alert("Einsetzen nur Buchstaben in Feld \"Staat\".");
    theForm.stato.focus();
    return (false);
  }
  var checkOK = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
  var checkStr = theForm.provincia.value;
  var allValid = true;
  for (i = 0;  i < checkStr.length;  i++)
  {
    ch = checkStr.charAt(i);
    for (j = 0;  j < checkOK.length;  j++)
      if (ch == checkOK.charAt(j))
        break;
    if (j == checkOK.length)
    {
      allValid = false;
      break;
    }
  }
  if (!allValid)
  {
    alert("Einsetzen nur Buchstaben in Feld \"Provinz\".");
    theForm.provincia.focus();
    return (false);
  }
    if (theForm.provincia.value.length == 1)
  {
    alert("Einsetzen 2 caratteri in Feld \"Provinz\".");
    theForm.provincia.focus();
    return (false);
  }
  var checkOK = "0123456789./";
  var checkStr = theForm.fax.value;
  var allValid = true;
  for (i = 0;  i < checkStr.length;  i++)
  {
    ch = checkStr.charAt(i);
    for (j = 0;  j < checkOK.length;  j++)
      if (ch == checkOK.charAt(j))
        break;
    if (j == checkOK.length)
    {
      allValid = false;
      break;
    }  
	}
  if (!allValid)
  {
    alert("Einsetzen nur numerische Buchstaben in Feld \"Fax:\".");
    theForm.fax.focus();
    return (false);
  }
  var checkOK = "0123456789./";
  var checkStr = theForm.cell.value;
  var allValid = true;
  for (i = 0;  i < checkStr.length;  i++)
  {
    ch = checkStr.charAt(i);
    for (j = 0;  j < checkOK.length;  j++)
      if (ch == checkOK.charAt(j))
        break;
    if (j == checkOK.length)
    {
      allValid = false;
      break;
    }  
	}
  if (!allValid)
  {
    alert("Einsetzen nur numerische Buchstaben in Feld \"Mobil:\".");
    theForm.cell.focus();
    return (false);
  }
}