Using Bukkit
From CyberWurx Customer Wiki
[edit] Enable Bukkit
To enable bukkit, log into your gamepanel account and view your minecraft server's server details. On the left hand side you will see Bukkit and a text box with either 1 or 0 inside.
Boolean value guide:
0 - Disabled 1 - Enabled 2 - Snapshot Build Enabled
Set this value to either 1 or 0 depending on if you want to enable or disable bukkit. Make sure you restart your server to apply the changes.
[edit] New!
You can optionally use the snapshot build of bukkit by setting bukkit to 2.