Use function instead of a controller

[eluser]ruiganga[/eluser]
Hi

This is my first CI project so please forgive my dumbness.

After viewing 3 full tutorials, I've designed my app like this:

Main Controller
- index function show app home
- login function show form
- logout function kills session and redirect to app root

Looks simple. I can do it if Login and Logout are Controllers, but instead, I wish them to be functions of Main controller.

site.com -> execute Main Controller index function

I expect to

site.com/login -> execute Main Controller login function

Any way to do this?

thanks for any help