[Request] Script: Round world

[Okami]

I need one script - let's say I have world map that looks like this:

[------------------------]
|          north            |
|                             |
|west                  east|
|                             |
|          south            |
[------------------------]

Without script if I walk to the North I'd come to the end of the map. So, is there any way to make map "round"? I mean, is there way to continue walk even across border so if I get to the border of weast I continue from the east? I know I could do it with 'teleport' but teleporting creates transition and I don't want it.

Any help is appreciated 

[Zeriab]

Teleporting does not necessarily create transitions
I've attached an example. In this case I've made a big world instead of a round world, but the procedure is similar.
You can sometimes notice a small lag.

I think I've seen a scripted solution at either hbgames.org or creationasylum.net