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Open a terminal window (Applications -> Utilities -> Terminal) and execute

   java -version

This should print something like:

   java version "1.4.2_05"
   Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_05-141.3)
   Java HotSpot(TM) Client VM (build 1.4.2-38, mixed mode)

If the version is different from "1.4.2_05", stop here and ask for 
assistance. Otherwise, execute the following commands:

   cd /System/Library/Frameworks/JavaVM.framework/Versions/1.4.2/Classes
   sudo mv classes.jar classes.orig.jar
   sudo curl http://endeavor.cc.gt.atl.ga.us/classes.cs1322.JDK1.4.2.jar -O
   sudo chmod 644 classes.cs1322.JDK1.4.2.jar
   sudo ln -s classes.cs1322.JDK1.4.2.jar classes.jar

That's it. To make sure that everything worked fine, execute again

   java -version

and check that you don't get any error. If you get an error at this 
point or after any of the commands above, ask for assistance.