Have you tried downloading this Java update? Hopefully it will help ....
The article below explains what this update does:
This release updates the Apple-provided system Java SE 6 to version 1.6.0_45 and is for OS X versions 10.7 or later.
This update uninstalls the Apple-provided Java applet plug-in from all web browsers. To use applets on a web page, click on the region labeled "Missing plug-in" to go download the latest version of the Java applet plug-in from Oracle.
This update also removes the Java Preferences application, which is no longer required to configure applet settings.