css file and methods

[eluser]mddd[/eluser]
@ricardino: Your explanation is useful, but I think this is not the problem here.

@mysterious: The problem is that your webbrowser looks at CodeIgniter addresses like any other addresses. The browser doesn't know about controllers, methods, and all the other stuff that is in CodeIgniter. If you use a relative url for a css file, an image or anything like that, your browser will try to find it from where it thinks it is in the directory structure.

What does this mean? It means that you should not use relative urls for things like css files, images and other linked files.
Why? Because you might have a CodeIgniter url like www.example.com/clients/some-client/projects/project123/sort/alphabetical.
If you want to make the browser understand that, you would have to link to ../../../../../../css/mycssfile.css...
And if you added another variable to it, you would also have to add another '..' to the url.

Therefore, the solution is to use absolute urls. Just link to /css/mycssfile and the browser will always be able to find it.
You can use the site_url() function in CI to create the right url, and still be flexible if you want to move the site later on.