public static function optgroup($text, $optKey = 'value', $optText = 'text')
	{
		// Set initial state
		static $state = 'open';

		// Toggle between open and close states:
		switch ($state)
		{
			case 'open':
				$obj = new stdClass;
				$obj->$optKey = '<OPTGROUP>';
				$obj->$optText = $text;
				$state = 'close';
				break;
			case 'close':
				$obj = new stdClass;
				$obj->$optKey = '</OPTGROUP>';
				$obj->$optText = $text;
				$state = 'open';
				break;
		}

		return $obj;
	}