<div id="upload_frame">
<% form_remote_tag (:update => 'upload_frame',
                    :url => {:action => 'upload_file'},
                    :html => {:multipart => true, :id => "upload_form"},
                    :loading => "Element.show('spinner');",
                    :complete => "Element.hide('spinner')") do -%>

    <%= render :partial => "form" %>

    <%= observe_field 'upload_ppt', :function => "$('upload_form').submit()" %>
<% end %>
</div>