/**
	 * Fetch Field Names
	 *
	 * @param	string	the table name
	 * @return	array
	 */
	public function list_fields($table = '')
	{
		// Is there a cached result?
		if (isset($this->data_cache['field_names'][$table]))
		{
			return $this->data_cache['field_names'][$table];
		}

		if ($table === '')
		{
			return ($this->db_debug) ? $this->display_error('db_field_param_missing') : FALSE;
		}

		$result = $this->field_data($table);
		$this->data_cache['field_names'][$table] = array();

		foreach ($result as $row)
		{
			$this->data_cache['field_names'][$table][] = $row->name;
		}

		return $this->data_cache['field_names'][$table];
	}