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Clone Rhino source code from this git repo, into "$rhino_dir"

https://github.com/mozilla/rhino

Use ant to build js.jar
    
    $rhino_dir/build/rhino1_7R5pre/js.jar

If you want to get pre-built binary instead, you can download from here:
https://developer.mozilla.org/en-US/docs/Rhino/Download_Rhino

    https://github.com/downloads/mozilla/rhino/rhino1_7R4.zip

In either way, you'd get js.jar file in this step.

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