I got some tips from some people at #xemacs in openprojects.org and cam up with the file in attachment. I know nothing about e-lisp so beware!! I just have one major problem now. I wanted it to load x-symbol instead of just LaTeX mode (and x-symbol-fontify after loading the mode). If anyone can do that I'd be really gratefull :-) J.A. P.S.: put the attached file in the directory wher you have the ".el" and add to you ~/.emacs (or ~/.xemacs/init.el), (require 'two-mode-mode). (I think :)