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If you want to disable Java 7 and use Java 6 again on your computer, follow Apple steps to do that > http://support.apple.com/kb/HT5559?viewlocale=en_US
My computer either seems to have hidden or completely removed anything Java on my computer. Java Preferences, JavaAppletPlugin, or any folder Java-related, but it's still on Java 7 Update 10.
There should be no need to remove it as both 6 & 7 can coexist and still use only one, but removal instructions are here.
However, you will find that the only Java that will work with Safari is Java 7u13 and Apple has not announced any plans to upgrade Java 6k for Lion / Mountain Lion users.
Your best bet would be to follow mend1's instructions for reverting to Java 6 and try Firefox, following these instructions on how to use Java if it has been blocked.