prevent writing to unmounted directory

[Chris <list.hurschler@gmx.de>]

Hello,

I want to run a script to rsync local files to a NAS mounted to /mnt/music.  
Sometimes the NAS is not running, and I want to prevent the script from 
writing to the mount directory:  is there any easy way to prevent this?

Thanks,

C
-- 
C. Hurschler