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Ok, I found the problem. It was missing a line in the header, the one that says:
Sorry for my bad english... :)
I love to learn, feel free to tell me when I misspell something.
Using Xoops 2.0.16, FC4, PHP 5.0.4-10.5, Apache 2.0.54-10.4, mysql-4.1.20-1.FC4.1.