Bug: Calling visual_effect within helper

This post is slightly long, please bear up with me. The problem is
little twisted.

I am quoting from the docs:-
http://api.rubyonrails.org/classes/ActionView/Helpers/PrototypeHelper/JavaScriptGenerator/GeneratorMethods.html

Helper methods can be used in conjunction with JavaScriptGenerator. When
a helper method is called inside an update block on the page object,
that method will also have access to a page object.

Example:

module ApplicationHelper
def update_time
page.replace_html ‘time’, Time.now.to_s(:db)
page.visual_effect :highlight, ‘time’
end
end

Controller action

def poll
render(:update) { |page| page.update_time }
end

Below is my helper code:-

module ContextsHelper
def sort_contexts
page.sortable(‘context_list’,
:complete =>visual_effect(:highlight, ‘context_list’),
:url => { :action => “sort” },
:handle=>“drag_handle”)
end
end

Following is how I reuse it in my view:

<%= update_page_tag() do |p| p.sort_contexts end %>

and in my controller as

def some_action
render :update do |page|

page.sort_contexts
end
end

The problem is that the output of “sort_contexts” helper is

new Effect.Highlight(“context_list”,{});
Sortable.create(“context_list”, {handle:‘drag_handle’,
onUpdate:function(){new Ajax.Request(‘/contexts/sort’,
{asynchronous:true, evalScripts:true, onComplete:function(request){new
Effect.Highlight(“context_list”,{});},
parameters:Sortable.serialize(“context_list”)})}});

See there is the extra Effect.Highlight as the first line. This is
completely uncalled for.

Please help me solve this issue.