Java Checker needs JRE to install??

Hi Everyone,
I have just downloaded the Java Checker for Personal Java and am having big trouble installing it. Could someone please advise. This is what it says in the install file:
The JavaCheck installation file is a zip archive that contains a set of
self-extracting class files. The JavaCheck download page describes the
correct method for extracting these files by using the "jre" command.
If you have tried to install JavaCheck by downloading the zip archive and then using an unzip utility to extract its contents, you have made a mistake. You should delete the unzipped files and directories and start over, being sure to use the "jre" command. Read the download web page for detailed instructions.
Could someone please tell me what command I have to use to do this. When I run java against the install class (which I extracted from the zip) I get an exception of not being able to find the file.
Thanks
Dan

http://java.sun.com/products/personaljava/install_instructions.html

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