hi
I have a function that runs in background every 10 seconds (with
run-at-time). That function saves a file, and this causes a message to
be displayed in the echo-area. I want to disable this message...


there was already a thread about that :
http://lists.gnu.org/archive/html/help-gnu-emacs/2009-08/msg00374.html


But the pointed solutions don't work

(flet ((message (&rest args) nil))
   (message "test")
   (write-file file)
   )
- the "test" message is not displayed, but the "write file" is still
displayed!


(let (message-log-max)
  (write-file file)
  )
- no effect!