The main Maths Pages require a browser capable of displaying frames and
running java-script. Your browser appears to be incapable of displaying
frames.
We suggest you download and install the latest version of the
Netscape Browser from
home.netscape.com
If you are using Internet Explorer you may have turned frame
viewing off - go to Options under Edit and then
Web Content and check
Show Frames.
There is a No Frames version of the
maths pages available, though some details may not be as up-to-date as in
the Framed version.