What if I need to reinstall Java?

I made the mistake of trusting a Java applet and the site downloaded a .jar which apparently corrupted the " javaws cache". I went into the java cache and deleted the items that were installed and no longer get the error but I am concerned that i don't have a complete java...
Do I need to reinstall Java?
Where do I get the latest Java for Leopard????
thanks!

Thank you for your time to answer my question... the problem is that the reference you posted is java for Apple OSX 10.4 only....
Is there a java for 10.5 out there? Is it in the Leopard install disk? How do I get to it? thanks so much!

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