public static function pad($value, $length = 5, $prfx = 0)
	{
		$pre = '';

		if (is_numeric($value) && $value < 0)
		{
			$pre = 'n';
			$value = abs($value);
		}

		while (strlen($value) < $length)
		{
			$value = $prfx . "$value";
		}
		return $pre . $value;
	}