Your browser does not support Frames which are used on Zero's Web site.
All of the same pages are available without a Frame based system at:
Zero's Web Site for older Browsers
The primary difference is that instead of a table of contents window
on the left side of your browser you will have to go to the bottom of
a page to see the navigation buttons that allow you to jump to different
areas in the Zero Web Site.
For your information, Netscape versions 2 and beyond support Frames
and Microsofts Internet Explorer versions 3 or better also support Frames.
You may want to download the latest version the Netscape Browser which is available
at Netscape Downloads
You should be aware that each release of a new Browser is larger on disk and
contains more features that you may not want to use. For this reason, I
recommend you stick with Netscape Version 3.01 unless you are certain that
you need Netscape Communicator 4.01 features. The download page above allows
you to download versions of Netscape all the way back to Version 2.01. If you
are still running Windows 3.1 or have a slow modem (14.4 Kbaud or less) then
you might want to get Netscape Version 2.01 which does support Frames and Javascript
but doesnt have color in Table Cells and some other nice features used on the
Zero Web Site. As a Zero Song would say, "Its Up To You..."
I do not recommend Microsofts Internet Explorer since it has deficiencies in
the implementation of Javascript used in the Frame based Web Pages although
it is fine in other respects. The primary deficiency from my point of view as
a Web page designer is that the nice buttons in the Table of Contents Frame on
the left dont light up when you run over them. This isnt a big deal so if you
really like Microsoft or already have it then Zero in on the Web site again.