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bind mouse1
into the console it should be something like +attack
but in case you can't set it, try clicking the Reset controls (or whatever its called) somewhere on the options screens.
type it again to find out what the default value is
next time if it messes up again just type that at the console
bind mouse1 "+attack"
(or whatever the default is)
From your question you were probably tricked into running unbindall and you'll have to reset your options anyway.
Here is a decent tutorial on key binds for most Valve FPS games:
http://www.overclockers.com/forums/showthread.php?t=176622
(found by random googling)