OK, I'm running MacOS X, 10.1.5. My java is

java version "1.3.1"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.1-root-020219-20:07)
Java HotSpot(TM) Client VM (build 1.3.1, mixed mode)

I'm trying to run apps from a site with Netscape 4.7 or Explorer 5.0 which
claim I do not have a Java Virtual Machine installed.

Any ideas how to proceed?

Mike