calendar/app/views/admin/calendars/new.html.erb

<% if !@categories.blank? %>
  <div class="modal-body">
    <div class="event_controller">
      	<%= form_for @event, :url=>admin_calendars_path, :remote=>true, :html => {:class=>"form-horizontal"} do |f| %>
      		<%= render :partial => 'form', :locals => {:f => f} %>
      	<% end %>
    </div>
  </div>
<% else %>
  <div class="event_summary alert" id="no-categories">
    No categories assigned.
    <a href="" class="close btn-close">&times;</a>
  </div>
<% end %>

<script>
  new FormValidator($("#new_event"));
</script>