I can't understand how to use MVC ...

[eluser]Bart v B[/eluser]
Ok topmenu and side bar are not static..

How are they build on?
I mean, they are depending on the controllername or something?
Then you can also do that the same way as i explained.

Other option is to use a template library.
for example https://github.com/philsturgeon/codeigniter-template/

In that case you can do something like this:
http://philsturgeon.co.uk/news/2010/02/C...ing-it-DRY

I don't know how complicated your site is, but if there ar just a few classes, models, and view files, then you better off with my first example.