[MECH] BorderGuard v4.31: #1, Most Efficient Map Limiter [1.4.7]

BorderGuard 4.31

BorderGuard is the MOST efficient Border plugin available!
100,000+ downloads! Thank you for your support!

This plugin prevents people from exploring beyond a defined border. This plugin checks for all movement, including vehicle movement, and will keep you within the border even if you remain within a vehicle.

Downloads:
http://minerealm.com/plugins/borderguard/BorderGuard.jar (v4.31)
(If you appreciate this plugin, please feel free to leave a comment below. =])

To set an invisible border:
/setborder <distance> <square|round> - Set the border, and the distance of the border from your current point. Optionally, also specify if the border is to be square or round.

To disable the border:
/disableborder - Remove the border.

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Only the person who first uses the /setborder command can use it again, or remove the border.

The plugin has multi-world support. When setting a border, you're only setting the border for the world you're presently situated in. You'll need to set a border for each separate world.



Version History:
V4.31 - Added a quick fix so that it'll work with the CraftBukkit development build.
V4.30 - Updated to work with the new Bukkit API (#1846) R5+
V4.20 - Fixed it so the save-file no longer becomes corrupted with multiple worlds. Code cleanup.

V4.11 - Changed getDisplayName() checks to getName().
V4.10 - Major performance enhancements. Using version 4 is highly discouraged.
V4.00 - Modified to work with the latest craftbukkit version (953). Older versions no longer work.
V3.10 - Removed the multi-threading, was causing accuracy issues.
V3.00 - BorderGuard Turbo! Now works with bukkit 670, and has completely overhauled the base BorderGuard "engine", resulting in a huge performance boost.
V2.40 - Updated to work with the latest version of bukkit. (602)
V2.30 - Resolved multi-world issues. Now properly handles multiple worlds.
V2.20 - Updated to work with the latest version of bukkit. Existing configuration files will no longer work. (Borders must be re-defined).
V2.10 - Updated to work with the latest version of bukkit. Fixed movement issues with the "round" version.
V2.00 - Multi-world support, better teleporting, no duplicate warning messages, configuration file now within folder.
V1.00 - Released plugin.

Notes:
1. Using, for example, "/setborder 5", will set the border 5 blocks away from the location you are standing. This would create a border that is 10x10 in size.
2. For the full plugin, with physical borders and more, take a look here: http://forums.bukkit.org/threads/mech-borderguard-v2-00-limit-your-map.656/

Let me know if you have any questions, or find any problems.
Enjoy!