run scripts at lock/unlock

[fish <fish guralp com>]

I would like automatically to run scripts when I lock and unlock my 
session - primarily to set my status in pidgin, skype and various other 
utils - but, after googling for an hour or so, dipping into the manuals 
and searching this list's archive, I am none the wiser.

I'd be very grateful for a pointer.

I'm using Gnome 2.24.1 on Ubuntu Intrepid.  I'm not sure what other 
information might be helpful.

Yours,
--



fish
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