public function isInVocabulary($id, $vocabularyId, $taxonomyId = null)
{
$conditions = array('term_id' => $id, 'vocabulary_id' => $vocabularyId);
if (!is_null($taxonomyId)) {
$conditions['Taxonomy.id !='] = $taxonomyId;
}
return $this->Vocabulary->Taxonomy->hasAny($conditions);
}