tracks/vendor/plugins/swf_fu/init.rb

ActionView::Helpers::AssetTagHelper rescue require 'action_view/helpers/asset_tag_helper' # Might be needed in some testing environments
require File.dirname(__FILE__) + "/lib/action_view/helpers/swf_fu_helper"
require File.dirname(__FILE__) + "/lib/action_view/helpers/asset_tag_helper/swf_asset"

# ActionView::Helpers is for recent rails version, ActionView::Base for older ones (in which case ActionView::Helpers::AssetTagHelper is also needed for tests...)
ActionView::Helpers.class_eval  { include ActionView::Helpers::SwfFuHelper } # For recent rails version...
ActionView::Base.class_eval     { include ActionView::Helpers::SwfFuHelper } # ...and for older ones
ActionView::TestCase.class_eval { include ActionView::Helpers::SwfFuHelper } if defined? ActionView::TestCase # ...for tests in older versions

begin
  ActionView::Helpers::AssetTagHelper.register_javascript_expansion :default => ["swfobject"]
rescue NoMethodError # I think this might fail in Rails 2.1.x
  ActionView::Helpers::AssetTagHelper.register_javascript_include_default 'swfobject'
end