Description of problem:
When a button is pressed on a CD/DVD drive with mounted media,
kio_media_mounthelper displays it cannot found
fuser command (trying to determine, wheter the mounted 
  filesystem is in use)
The exact message is
/usr/bin/env: fuser: No such file or directory

Version-Release number of selected component (if applicable):
kdebase-3.5.7-0.1.fc6.i386

How reproducible:
Always on fc6+kde, non-root user

Steps to Reproduce:
1. mount a CD or DVD using mount command
2. press eject button on CD/DVD drive
3. watch kio_media_mounthelper window contents
  
Actual results:
fuser is called without path, however, fuser is not in $PATH
for non-root user

Expected results:
Should display processed using media

Additional info:
as a workaround, because ~/bin is in $PATH,
after
ln -s /sbin/fuser ~/bin
the kio_media_mounthelper message is as expected (fuser successfully called)
BTW. 
My setup is modified so that media does not get automatically mounted,