The interactive activities described on this page require JavaScript

If you are using Internet Explorer:

1. On the Tools menu, click Internet Options, and then click the Security tab.
2. Click the Internet zone.
3. Click Custom Level. In the Security Settings – Internet Zone dialog box, click Enable for Active Scripting in the Scripting section.
4. Click the Back button to return to the previous page, and then click the Refresh button to run scripts.

If you are using Firefox:

1. On the Tools menu, click Options.
2. On the Content tab, click to select the Enable JavaScript check box.
3. Click the Go back one page button to return to the previous page, and then click the Reload current page button to run scripts.

If you are using Safari:

1. On the Safari menu, click Preferences
2. Select the Security tab
3. Check the 'enable Javascript' box
4. Click the Go back one page button to return to the previous page, and then click the Reload current page button to run scripts.