function verifica(form)
	{ if(form.nome.value  == "")   
		{alert("Please insert your surname and your name, thank you.");  
   form.nome.focus();
	return false;   
	} else if(form.email.value == "")                             
		{ alert("Please insert your email address, thank you.");      
     form.email.focus();        
	return false; 
	}  else if(form.oggetto.value == "")                                      
		{alert("Please insert the subject of your message, thank you..");        
       form.oggetto.focus();                  
	return false; 
	} else if(form.testo.value == "")            
		{alert("Please write your message, thank you.");  
   form.testo.focus();         
	return false;                                  
	}
	 <!-- Controlla che sia un indirizzo di e-mail valido -->
  var pattern = form.email.value.match(/\S+@\S+\.\S+/);
  if (!pattern)
  { 
   	alert("Please check your email account, thank you.");
	form.email.focus();
    return (false);
}
 if (form.privacy.checked==false)
  {
    alert("You must read and approve our policy privacy, thank you.");
    form.privacy.focus();
    return (false);
}



}