omitting/ignoring whole directories in dired

["oliver" <oliver_baumann@nospam.justemail.net>]

hi there

i use dired and its extension dired-x to browse recursive directory trees (i 
load them into a buffer with C-U dired "-alR").

in the dired buffer i want to ignore/omitting all CVS subdirectories. with 
the command

(setq dired-omit-files (concat dired-omit-files 
"\\^CVS$\\|^Root$\\|^Repository$\\|^Entries.Old$\\|^Entries.Extra.Old$\\|^Entries.Extra$\\|^Entries$")))

i can avoid all entires _in_ a cvs dir and the CVS entry _inside_ another 
dir but not the line which lists the CVS diretory itself (now, of course, 
without any file in it).

any idea what i can do to avoid this directory entry itself???

thanks, olli