<?phpfunction filled_out($form_vars){  // test that each variable has a value  foreach ($form_vars as $key => $value)  {     if (!isset($key) || ($value == ''))         return false;  }   return true;}function valid_email($address){  // check an email address is possibly valid  if (ereg('^[a-zA-Z0-9_\.\-]+@[a-zA-Z0-9\-]+\.[a-zA-Z0-9\-\.]+$', $address))    return true;  else     return false;}?>