How to create a spawn between worlds? (Minecraft)?

I have a bukkit server and I use multiverse and essentials and I want the player to be able to do /spawn and have them teleport to the world I set as the spawn. It just teleports you to another world called "world". How do I change this? I have been working on this server for the last 6 months and it is supposed to be finished by Jan 1.

I don't know the answer, but try minecraft wiki, or email some server creators!
What is you server IP address?