Runnig a command automatically when (un)mounting

Hello.

I am looking for a way to automatically run a command (preferably chosen
by a non-root user) right after mounting or right before unmounting a
device. Specifically, I want to run a simple script synchronizing some
data on an USB flash drive with its hard disk backup every time the USB
drive is plugged in or out.

Does e.g. HAL or gnome-volume-manager/gnome-mount (I use GNOME) enable
such a thing?

Regards,
--
Krzysztof Lubanski
.

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