You need to turn on Javascript in your browser.

In Microsoft Internet Explorer 4 or greater:

• From the "Tools" menu (in IE 4, it's the "View" menu), select "Internet Options".
• Click on the "Security" tab.
• Click on the "Custom Level" button. (In IE 4, select "Custom" and then click on "Settings...".)
• Under "Active scripting" make sure "Enable" is selected.

In Netscape version 4 or greater:

• From the Edit menu, select Preferences.
• In the Category list on the left, click on the word "Advanced".
• In the panel on the right, make sure "Enable JavaScript" is checked.
• Click the OK button.