public static function getInstance($group)
	{
		static $instances;

		// Set instances array
		if (!isset($instances))
		{
			$instances = array();
		}

		// Do we have a matching instance?
		if (!isset($instances[$group]))
		{
			// If an ID is passed, check for a match in existing instances
			if (is_numeric($group))
			{
				foreach ($instances as $instance)
				{
					if ($instance && $instance->get('gidNumber') == $group)
					{
						// Match found
						return $instance;
						break;
					}
				}
			}

			// No matches
			// Create group object
			$hzg = new self();

			if ($hzg->read($group) === false)
			{
				$instances[$group] = false;
			}
			else
			{
				$instances[$group] = $hzg;
			}
		}

		// Return instance
		return $instances[$group];
	}