Replacing KDE shutdown dragon

["Elmer E. Dow" <elmeredow@earthlink.net>]

Greetings:

I've been trying to replace that dragon on the KDE logoff gui. I'm running 
Sarge on both the family desktop machine and on my laptop and found the 
critter at /usr/share/apps/ksmserver/pics/shudownkong.png. If I change the 
dragon's filename, the dragon disappears from the logoff. I tried 
substituting another png file (renaming it shutdownkong.png in the proper 
directory), but it won't display on the logoff gui. I've found only a couple 
of other png files on the system that work (such as the kde bomb crash pic -- 
not quite what I want), but when I try using an image from KDE-Look.org that 
I've prepped and saved as a png, it just won't display. What am I 
overlooking?

Elmer