I need to re-install java, How do I?

Hi,
I am attempting to play Minecraft(a game) but apparently I have a broken Java installation.
I have been asked to find out how (Because the IT at school do not know) to reinstall java6.
I am running Mac 10.6 Snow leopard.
Erm...
Comment if I need to post any more info.
P.S. I mean re-install Java 6 (I cant run Java 7 on my mac)

You are backing up against the unlikely event of a problem with the process.   It is very unlikely.   Moreover, the Combo updater is working on the system and should not affect files or other programs providing they don't naturally conflict.
One cannot give a 100% guarantee with computers but I think you would be safe to apply the Combo.
I shall be away for a day or so but if you have more questions someone will pick up on the conversation.
Hope it all eventually helps you.

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