Making Default Web and Mail clients?
 

When I click on a email link or URL hyper link, Fedora Core 2 running KDE 3.2 wants to open up Mozilla web browser and Evolution mail set up everytime.

I don't like these and want KDE to understand that Firefox 0.9 and Thunderbird are my prefered default clients.

How in KDE or Fedora Core 2 Linux do I make this possible? Is there a way to remove evolution and Mozilla web browser?

Thanks for any info.