mailto: leads to Evolution - how to change to KMail?

[Claude Jones]

I'm using FC5 and Firefox and my desktop is KDE: my preferred mail client is 
KMail. When I click on a mailto: link in Firefox it opens Evolution. I 
searched on "mailto:" in "about:config" in Firefox, but the settings that 
came up were non-intuitive, and none indicated a client to use. I looked 
through the settings in KDE Control Center and in KDE Components/Component 
Chooser KMail is set as the EMail client. Not sure where to look next - 
suggestions? 
-- 
Claude Jones
Brunswick, MD, USA