This tutorial shows you how to use the Jail feature in the Essentials plugin for Bukkit.

The jail function is a way of locking up someone who breaks the rules, a great alternative to banning people.

To jail a player, you use the following command:

/jail playername jailname

Jailname can be "tree" (without speech marks) as that is the first jail on the server.

To unjail a player, you use:

/unjail playername

This puts them back in the location before they were jailed.

Hope that helped! :)