Attaching users id to my url structure

[eluser]RalphLeMouf[/eluser]
That is good to know for future reference but that does not really apply to what I am trying to do. I'm not trying to make a link right now, I'm just trying to put that in the controller and make it dynamic per $userid and then my system well be able to tell if it's a user looking at their own profile or looking at someone elses. Make sense?