Using Javascript to Obfuscate Email Addresses

I use this fabulous email thingy which codes your email address using javascript:
http://hivelogic.com/enkoder/form

I have two web sites - both are Atahualpa 3.0.1

In one, I can use the enkoder, and in the other, I cannot, it will not show up.

I have NO idea why it works in one and not the other.

Any ideas, anyone?