• Navigator 3.x
  
  Go to "Options | Network Preferences..." from the main menu
  Change to the "Languages" tab
  To enable: make sure "Enable JavaScript" check box is checked
  To disable: make sure "Enable JavaScript" check box is unchecked
  Restart the browser



• Communicator 4.x
  
  Go to "Edit | Preferences..." from the main menu
  Select "Advanced" panel
  To enable: make sure "Enable JavaScript" check box is checked.
  To disable: make sure "Enable JavaScript" check box is unchecked.
  Restart the browser



• Explorer 3.x
  
  Go to "View | Options..." from the main menu
  Change to the "Security" tab
  To enable: make sure "Run ActiveX scripts" check box is checked
  To disable: make sure "Run ActiveX scripts" check box is unchecked
  Restart the browser



• Explorer 4.x
  
  Go to "View | Internet Options..." from the main menu
  Change to the "Security" tab
  Select "Custom" and click on the "Settings..." button
  To enable: make sure "Enable" is selected under "Active scripting"
  To disable: make sure "Disable" is selected under "Active scripting"
  Restart the browser