[SOLVED] query /w pagination

[eluser]predat0r[/eluser]
Is it possible to pass a variable/string through an uri segment to a controller, to modify a query?

What I want to do, if someone clicks on "x category" anchor link in my blog, I want to filter the query (my posts), with pagination remain working.

Example link:

anchor('site/posts/2', '') - where 2 is the category_id

How to mix the category param and pagination numbers?

Thank you