load image and css file

[eluser]123XD[/eluser]
Hey,

I have some problem with loading images and css file using CI6.0

I have directory structure like this

www
-sytem
--application
---views <- (all my web pages)
----css <- (all my css files)
----images <- (all my images for website)


my question is where does dir 'css' and 'images' should locate so it won't affect even I change my domain name. Like for any web server i just need to directly upload files and it should just work.

- How to config the base_url, I am lost.
- And how to get rid of the index.php, I have seen some articles about IIS url rewrite,
but I sitll can't make it work



Thanks in advanced.