$("#<%= dom_id @bulletin_category %>").replaceWith("<%= j render :partial => 'bulletin_category', :collection => [@bulletin_category] %>");
<% @bulletin_category = BulletinCategory.new(:display => 'List') # reset for new form %>
$(".edit_bulletin_category").replaceWith("<%= j render "form" %>")
$(".new_bulletin_category")[0].reset();