Which JRE version to compile for?

My project is intended for non-developers, and as much as possible, I want my program to just work, without prompting the user to go find and install the latest this or that.
It looks like current generation of OS X (Leopard) comes with JRE 1.5 installed by default. How about XP? How about Vista?
What version of JRE should I compile my project for, to ensure the least hassle for users?
-Ron.

Optimistic but probably unrealistic.
What you normally do is program for the lowest common denominator that you are willing to support.
Windows doesn't come with java. And if you read this site you will find an infinite number of ways for consumers to mess up an install that did work just fine.

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