[eluser]Jose Dueñas[/eluser]
Thanks to everyone for your help.
I've realized in PHP you cannot use nested classes as marcoss said (this has been an epic FAIL for me, hehe).
Elliot's answer could be a solution, I like it, I thought about create a library as D13 said, but I'd prefer something more simple.
My problem mainly is: My app has a section listing all the articles in te database, but i want to show in the frontpage, last 10 articles. If I have defined a "Article controller" in index.php/article/show, how could I use that controller to show last 10 articles in the frontpage (index.php)?
So I cannot use the article controller inside the frontpage controller, so I decided to create another article class inside frontpage controller...
Well, I think I'm messing a bit.. hehe
Elliot, I'm one of your followers (Twitter), thanks also for your CodeIgniter libraries, i'm using them in some of my projects. You're great man!