Disable Java in Safari for specific sites

Does anyone know of a way I can disable Java on some sites in Safari, but have it enabled for the rest? I don't see an option natively, but maybe there is a plugin or a plist that can be edited?

The reason is my university uses Blackboard / Vista and every time I log in it asks me if I want to allow it to run. I refuse to do so, and it doesn't have an option to never allow it to run for this site.

Please don't bother posting if you do not know the difference between Java and JavaScript.

Running the latest version of Safari on OS 10.6.2