and the browser doesn't need to download it again if it is already in the browser's cache. This was one of my inspirations as I've been doing a lot of browser Javascript lately. The addition I made was to avoid getting the latest version automatically, as I imagined people might be nervous about that. (I know I would be. After all, Javascript in the browser runs in a sandbox, but Arc on your server can call (system "rm -rf /") etc...)