Working With Url

Im finishing up a content management system for a client. It works fine except the way they have the pages set its nessessary for someone to open each page made and change it to the new directory.

the script copys a folder from lets say

http://fake/templets

To

http://fake/user
so now we end up with something like
http://fake/user/smith

On the pages in smith is there a way to make the look at their url and strip off all but the /smith part?

Or maby someone could tell me what im trying to do is called and ill be able to do a better search online.