Internet Explorer

• Select Tools | Internet Options… menu item from the main menu.
• Change to the Security tab at the top of the Internet Options window that pops up.
• From the list of zones at the top of the Security options select the internet icon.
• Select the button near the bottom that reads Custom Level.
• In the new window that pops up, scroll down to the item that reads Active Scripting.
• Select the option marked Enable.

Mozilla Firefox

• Select Tools | Options... from the main menu.
• Select Content button from the top row of options.
• Select "Enable JavaScript." (You do not need to enable Java, but it is OK if you do.)
• Note: You may wish to install the NoScript extension for Firefox to control which sites can run JavaScript.

Safari

• Select Preferences from the Safari menu.
• Select Security tab at the top.
• Make sure "Enable JavaScript" is checked.