disable save picture as desktop

I have a mac lab that is managed by workgroup manager on a mac server. Do you know of a way to disable the right click and save image as desktop picture.  I have students that keep changing the desktop background.  I haven't found a way to disable it. I have it setup so they can't get to any of the preferences.  
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dsexton18Asked:
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James LooneySr. Programmer/AnalystCommented:
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dsexton18Author Commented:
I was able to find the fix I needes sorry i forgot to close out the ticket.
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