How do you edit your URI segments?

[eluser]KeyStroke[/eluser]
I have an application that utilizes URI's the usual way like this:

Code:

http://example.com/index.php/controller/function/var1/var2/var3

I'm controlling those variables through my view file, as they're basically links to categories in different places (e.g: /usa/texas/computing).

The problem is that now var1 and var2's values should be different for some links.

How do I change them in a simple, re-usable way?



Your help is much appreciated.