$('.categories-widget .categories.editable form#new_category').before(
  '<%= escape_javascript(render :partial => "show", :object => @category ) %>'
);
$('.categories-widget .categories.read').append(
  '<%= escape_javascript(render :partial => "show", :object => @category, :locals => { :read => true }) %>'
);
$('.categories-widget .categories.editable form#new_category input#category_label').val('');