[Rails] how to import default js file in rails 3.1

in app\views\layouts\application.html.erb
when i write
<%= javascript_include_tag :defaults %> ,
i get
<script src="/assets/defaults.js" type="text/javascript"></script>
at source file.

<%= javascript_include_tag "application" %> gets
<script src="/assets/application.js?body=1"
type="text/javascript"></script>.

<%= javascript_include_tag :defaults %> also didn't work.

how to solve this?

thanks.

ruby -v
ruby 1.9.2p290 (2011-07-09) [i386-mingw32]

rails -v
Rails 3.1.1

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