.htaccess url rewriting with php

[Pt luci]

I currently have an entire website running on PHP & GET variables.My links look like this at present\[code\] http://www.example.co.uk/brochure.php?cat_path=24\[/code\]And occasionally it has a second variable in the url...I actually would like my URLs to look like this: http://www.example.co.uk/Concrete_Fence_PostsSo my questions is simply, how do I go about rewriting urls without breaking my GET variables.Thanks.