public function update_custom_user_data($table = FALSE, $row_id = FALSE, $custom_data = FALSE)
	{
		if (! is_array($custom_data) || empty($this->auth->database_config['custom']))
		{
			return FALSE;
		}

		// Loop through user custom data table(s)
		foreach ($this->auth->database_config['custom'] as $custom_table => $table_data)
		{
			$identifier_id = FALSE;

			// Get tables primary key, if not submitted, try to match the rows secondard key column.
			if ($row_id && $table_data['table'] == $table)
			{
				$identifier_id = $row_id;
				$identifier_col = $table_data['primary_key'];
			}			
			else if (isset($custom_data[$table_data['primary_key']]))
			{
				$identifier_id = $custom_data[$table_data['primary_key']];
				$identifier_col = $table_data['primary_key'];
				unset($custom_data[$table_data['primary_key']]);
			}
			else if (isset($custom_data[$table_data['foreign_key']]))
			{
				$identifier_id = $custom_data[$table_data['foreign_key']];
				$identifier_col = $table_data['foreign_key'];
				unset($custom_data[$table_data['foreign_key']]);
			}

		}

	}