On the Plug-in page
http://java.sun.com/products/plugin/index-1.4.html the URL to the Runtime Plug-in for HP-UX is wrong.

http://java.sun.com/products/plugin/download/hpux.html
Hewlett-Packard Company has developed the "Runtime
Plug-in for HP-UX, Java TM Edition, version 1.1.3 and 1.2.2".
It can be downloaded from
http://www.unix.hp.com/java/index.html.

Change
http://www.unix.hp.com/java/index.html
to
http://www.hp.com/products1/unix/java/index.html
(Java products for hp-ux)

Also remove the versions 1.1.3 and 1.2.2 from the above text.

Change the text to something like the below.

Hewlett-Packard Company has developed the "Java TM Runtime Plug-in for HP-UX". It can be downloaded from
http://www.hp.com/products1/unix/java/index.html