extending the Rails Recipies sortable list example to include multiple lists

Hi all

I have a site design with 3 sortable lists on the same page. i want to
be able to drag my <li>s between <ul>s if that makes sense. how can i
change the example code to do this:

controller:

class GroceryListController < ApplicationController
  layout "standard"

  def show
    @grocery_list = GroceryList.find(params[:id])
  end
  # ...

  def sort
    @grocery_list = GroceryList.find(params[:id])
    @grocery_list.food_items.each do |food_item|
      food_item.position = params['grocery-
list'].index(food_item.id.to_s) + 1
      food_item.save
    end
    render :nothing => true
  end

end

view:

<h2><%= @grocery_list.person.name %>'s Grocery List</h2>
<h3><%= @grocery_list.name %></h3>

<ul id="grocery-list">
  <% @grocery_list.food_items.each do |food_item| %>
  <li id="item_<%= food_item.id %>" style='color:'>
  <%= food_item.quantity %> units of <%= food_item.name %>
  </li>
  <% end %>
</ul>

</div>

<%= sortable_element 'grocery-list',
      :url => { :action => "sort", :id => @grocery_list },
      :complete => visual_effect(:highlight, 'grocery-list')
%>

Doesn't anyone know a tutorial for this?

Marc