Sortable_element - dotted line property around drop target?

Rails
1

Hey - does anyone know how to put a dotted lined around the target
drop point using the sortable_element? For example - those that use
iGoogle - if you move your modules around you will see the target drop
points noted with a dotted line before you actually release the mouse.

Here is my code:

    <% for user in @all_users %>
  • <%= user.name %>
    • <% end %>

<%= sortable_element ‘user_list’,
:url => {:action => ‘sort_user_list’ },
:scroll => ‘window’ %>

Thanks in advance!