Locking the Dock

[DANTE Mclean]

Wondering if anybody knows of a way to "lock" the icons in the dock?

I've got an iMac--I belive running under 10.4--in the Kindergarten room.  
The kids removed a dock icon by accident.  I figure, once they discover the 
little "poof" when you take an icon out of the dock, it won't be long before 
it is an intentional accident.

I'd like to be able to restrict the privileges on their account a bit more, 
say something similar to what I can do with Mac Manager on the 9.2.2 
machines in the computer lab.

At the very least, the dock must be locked.

Thanks.

Dante McLean
System Administrator / Technology Teacher
Wanipigow School