def javascript_include_merged(*sources)
options = sources.last.is_a?(Hash) ? sources.pop.stringify_keys : { }
if sources.include?(:defaults)
sources = sources[0..(sources.index(:defaults))] +
['prototype', 'effects', 'dragdrop', 'controls'] +
(File.exists?("#{config.root}/public/javascripts/application.js") ? ['application'] : []) +
sources[(sources.index(:defaults) + 1)..sources.length]
sources.delete(:defaults)
end
sources.collect!{|s| s.to_s}
sources = (should_merge? ?
AssetPackage.targets_from_sources("javascripts", sources) :
AssetPackage.sources_from_targets("javascripts", sources))
sources.collect {|source| javascript_include_tag(source, options) }.join("\n")
end