.bashrc security

[Jared Sprague <sfpiaga@yahoo.com>]

Hello all you Linux gurus out there!  
I have a problem that maybe you can help me with.  I
work in the Linux lab at my school, and every time I
leave my terminal for any amount of time my co-workers
put all kinds of nasty stuff in my .bashrc. Usually
they put in a logout, then log me out so I cant log
back in again, without getting root to remove the
logout.  Is there a creative way to protected my
.bashrc, so that it is very difficult for anyone other
than myself to alter it?  This would be very nice as I
hate always having log all the way out of my account
just to get a drink of water or something.

Thanks for any advice!

- Jared



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