Use browser webmaster tools like Opera Dragonfly or Firebug - network tab - to see, if your file returns 404 not found.
If you need to autoload your js file in refinery backend, add path to it in your_app/config/initializers/refinery/core.rb file, at the end of file:
config.register_stylesheet "folder/your_file"
If you have own engine and you want to autoload that js file in backend, create file core.rb under your_engine/config/initializers/refinery/
# Example for multiple JS/css files
Refinery::Core.configure do |config|
# Register extra javascript for backend
config.register_javascript "refinery/photo_gallery/admin/photo_gallery.js"
config.register_javascript "refinery/photo_gallery/admin/jquery.chosen.min.js"
#Register extra stylesheet for backend (optional options)
config.register_stylesheet "refinery/photo_gallery/admin/photo_gallery.css"
config.register_stylesheet "refinery/photo_gallery/admin/chosen.css"
end
Hope, it helps you.