adding to a sortable_element

Am adding to a sortable list using Ajax, and to get the Scriptaculous
effects to kick in after the add, the only way I have found is by
re-executing sortable_element.

Can anyone suggest a better way of doing this, as the eval in here is
not good.

<%= link_to_remote "Add",
    :url => { :controller => "pages", :action => "add_fragment", :pid =>
pid, :index_size => index_size, :fid => fid },
    :complete => "eval(decodeURIComponent(#{sortable_element
'frag_list', :url => sort_frag_pages_path, :complete =>
visual_effect(:highlight, 'frag_list'), :handle =>
'handle'}).gsub('//',''));" %>