[SMARTY] Best way to change menu if on current page?

Hi all,

I have a nav bar with 4 links. Right now, I assign the 4 links  
(titles and url) to a smarty var named "topmenu", and in the  
template, I use a {section} loop to display them. First of all, is  
the section loop appropriate for this use, or should I use something  
else? Second, I want the link to be a different color, and not be a  
link if the user is on that page. How should I do this?

Also, should I even be defining the links in PHP? I had to for  
another menu on the same page because the links come from a database.

Thanks!