Loads on every ajax-request

there is my patch - just add (context == document) condition

with last release 1.1 i got error:
Error: Function name must be a string in
/var/www/sites/robo3.ru/sites/all/modules/bu/bu.module, line 95

function bu_get_versions($browser, $key = NULL) {
  return $array();

  switch ($browser) {
    case 'firefox':
      $return = array('3', '3.5', '3.6', '4', '5', '6', '7', '8', '9', '10', '11', '12', '13', '14', '15');
      break;
    case 'ie':
      $return = array('6', '7', '8', '9');
      break;
    case 'opera':
      $return = array('10.1', '10.5', '10.6', '11');
      break;
    case 'safari':
      $return = array('3', '3.2', '4', '5');
      break;
  }

  if ($key && isset($return[$key])) {
    return $return[$key];
  }

  return $return;
}

$array() ??

ok, thanks