Rails - Jul 2006 - Page 129 of Agile Web Dev on Rails (or pg141 of pdf!)

Hi - another question, sorry....

I''m trying to get the highlighting effect to work on the current_item. 
The page refreshes fine, and then I get an error as the highlighting 
code is fired:

page[:current_item].visual_effect :highlight,
                                  :startcolor => "#88ff88",
                                  :endcolor => "#114411"

The error is: RJS Error [object Error]  (which is helpful!)

Followed by a pop up window containing the page code, the last line of 
which is:
$("current_item").visualEffect("highlight",
{"startcolor":"#88ff88",
"endcolor":"#114411"});

Code in cart.rb:
# add a product to the cart
  def add_product(product)
   current_item = @items.find {|item| item.product == product}
    if current_item
      current_item.increment_quantity
    else
      current_item = CartItem.new(product)
      @items << current_item
    end
    current_item
 end

Code in storecontroller.rb:
 # add a product to the cart
  def add_to_cart
    begin
      @product = Product.find(params[:id])
    rescue
      logger.error("Attempt to access invalid product #{params[:id]}")
      redirect_to_index("Invalid product")
    else
      @cart = find_cart
      @current_item = @cart.add_product(@product)
    end
  end

Code in _cart_item.rhtml:
<% if cart_item == @current_item %>
  <tr id="current_item">
<% else %>
  <tr>
<% end %>
  <td><%= cart_item.quantity %>&times;</td>
  <td><%= h(cart_item.title) %></td>
  <td class="item-price"><%= format_price(cart_item.price)
%></td>
</tr>

What is it that I can''t see!?

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