Mass Password Changes

I have 375 generic student IDs that I need to reset the
passwords on each account to be blank. Is there anyway to
do this in Active Directory, either from the GUI or command
line. All of the generic user accounts are in one container, in
my tree. I need to do this every semester, which ours starts
the 26th of this month. At the present time, I have to reset
each one of them ine at a time, which is very time
consuming.

Thanks,

Gomery