function validate_form(){


	if(document.thisform.xform_nome.value==""){alert('Manca il nome');return false;}
	if(document.thisform.xform_cognome.value==""){alert('Manca il cognome');return false;}
	if(document.thisform.xform_email.value==""){alert('Manca l\'e-mail');return false;}

	if(	document.thisform.date1.value=="" 
  		& document.thisform.date2.value=="" 
      & document.thisform.xform_persone.value==""
      & document.thisform.xform_note.value==""
      ){
  	alert('Non e\' stata inserita alcuna richiesta.');
    return false;
  }
  
	if(document.thisform.date1.value!="" & document.thisform.date2.value!="" & document.thisform.xform_persone.value==""){
  	alert('Non e\' stato specificato il numero di persone.');
    return false;
  }
  
	return true;
}