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This should disable it in Firefox:<br />
<a href="http://support.mozilla.com/tiki-view_forum_thread.php?locale=el&comments_parentId=137067&forumId=1" rel="ugc">http://support.mozilla.com/tiki-view_forum_thread.php?locale=el&comments_parentId=137067&forumId=1</a><br />
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For Safari and locking the desktop.plist, check this post<br />
<a href="http://discussions.apple.com/thread.jspa?threadID=1331007" rel="ugc nofollow">http://discussions.apple.com/thread.jspa?threadID=1331007</a><br />

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This should disable it in Firefox:
http://support.mozilla.com/tiki-view_forum_thread.php?locale=el&comments_parentId=137067&forumId=1 [http://support.mozilla.com/tiki-view_forum_thread.php?locale=el&comments_parentId=137067&forumId=1]


For Safari and locking the desktop.plist, check this post
http://discussions.apple.com/thread.jspa?threadID=1331007 [http://discussions.apple.com/thread.jspa?threadID=1331007]


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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. &nbsp;I have students that keep changing the desktop background. &nbsp;I haven't found a way to disable it. I have it setup so they can't get to any of the preferences. &nbsp;
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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.  

disable save picture as desktop

Mac OS X is the desktop operating system from Apple Inc., found on Macintosh computers. OS X consists of a Mach/BSD-based kernel, operating system interfaces primarily based on FreeBSD and additional frameworks (written in C, C++ and Objective-C providing user interface and application-level services.

Mac OS X

Apple's early computers ran on a variety of operating systems, including a Pascal version and one based on CP/M, before releasing its ProDOS with the advent of its 16-bit computer. With the release of the Lisa, which had its own OS, Apple and computing entered the graphical age; it was followed by the Macintosh, which offered a series of "System" operating systems. Other Mac operating systems included PowerPC until Apple acquired NeXT and folded it into the Mac OS. Current operating systems for Apple devices are Mac OS-X and iOS.