Restricting Internet access using ARD

I am trying to restrict students for accessing the internet using ARD. Students accounts are set using Workgroup Manager. Under preferences, I did not allow Dock.app or Safari in the list of aproved applications. I also only selected applications I allow them to use to be in the dock and did not allow them to merge their dock.
One group still has Safari listed in the dock.
The others can still get to the internet using dashboard and going to weather settings.
How can I eliminate this access.

One option is to send the unix command:
ipfw add 2005 deny tcp from any to any 80 out xmit en0
This will block the standard internet port. If the computers are restarted then it will go back to normal. To get rid of the rule without actually restarting use this command.
ipfw delete 2005
Note: They have to be done with the root (or admin) user.
PowerBook G4 15in, Xserve, G5 Dual 2ghz,   Mac OS X (10.4.3)  
PowerBook G4 15in, Xserve, G5 Dual 2ghz,   Mac OS X (10.4.3)  

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