If you have an administrative account on a computer, you can control which websites other users on your computer can view.
With parental controls turned on, Safari permits a user to view approved websites only. The user also can’t type web addresses in the address field, use the Google search field, or modify bookmarks.
If you have Mac OS X v10.5 Leopard, open the Parental Controls pane of System Preferences. For more information, click the Help button in Parental Controls.
If you have Mac OS X 10.4 Tiger, click this topic: