After some cleanups and improvements, I’ve put online a new downloadable ProtoRPG bundle that includes proper source code. A few comments :

• The game can run locally, but you still need to download Prototype and Script.aculo.us separately and save them in the /javascripts/ directory.
• I’ve included a functional, if somewhat crude, map editor.
• There’s also a sample PHP script to handle server-side savegames.

As usual : software is provided “as is” with no warranty, use at your own risks