Sorry, the JavaScript For.. loop demonstration page only works with IE4, and you're using a different browser.
The hyperlink you clicked on the previous page defaults to loading this page, but when the previous page is running in IE4, it changes the hyperlink object's .href property to point to the real For.. loop page instead.
Using this technique, you can make your hyperlinks switch targets dynamically, depending on which browser they're running in.
To see how it's done, view the source of the previous page.