You may have disabled JavaScript - which is needed.
Please enable JavaScript (examples below) and click the reload button on your browser.

MS InterNet Explorer 5 On the browser Menu
Tools >> Internet Options
Choose Security tab
Choose Internet zone
Click button marked Custom Level...
Scroll down over three quarters of the way until you find the heading Scripting
The first subheading is Active Scripting
Look at the buttons beneath
Ensure that the button marked Enable is checked as shown.
Click buttons to make and confirm changes.

Netscape Navigator 4

On the browser Menu
Edit >> Preferences...

Ensure the Advanced label is highlighted as shown.

Locate the checkbox marked
Enable JavaScript

This is shown at right unchecked.

You need to make this CHECKED.

Click OK Button