Hi Med -
You can install the JRE (Java Runtime Environment) instead if you like, although it's 1.2. This package leaves off the bytecode compiler and other tools not needed at run time.
Here is the link.
Sun's pages encourage you to migrate to 1.3, but they haven't yet delivered a "run-time only" package for it.
------------------
Michael Ernest, co-author of:
The Complete Java 2 Certification Study Guide