while rspec executes the test 'can see document sections linked to an Aipo' capybara founds the img but the click action does nothing. the page doesn't load. When I use the command prompt to interact with capybara it works si Console_input file

capy_console.rb

require "selenium-webdriver"
require 'capybara/dsl'
 
Capybara.default_driver = :selenium
Capybara.default_selector = :css
Capybara.default_wait_time = 5
Capybara.app_host = 'http://localhost:8080/TM'
 
CapybaraApi = Object.new
CapybaraApi.extend(Capybara)

require 'irb'
 
def IRB.start_capybara_console
  IRB.setup(__FILE__)
 
  irb = IRB::Irb.new(IRB::WorkSpace.new(CapybaraApi))
 
  @CONF[:IRB_RC].call(irb.context) if @CONF[:IRB_RC]
  @CONF[:MAIN_CONTEXT] = irb.context
 
  trap("SIGINT") do
    irb.signal_handle
  end
 
  begin
    catch(:IRB_EXIT) do
     irb.eval_input
    end
  ensure
    irb_at_exit
  end
end
 
IRB.start_capybara_console

Console_input

Capybara.find(:xpath,"//img[@alt='viewActor119']").click
# the link is found and the click action opens the web page

my_spec.rb

require 'spec_helper'

describe 'Aipo' do
  context 'editor' do
    before(:each){
      login_with(get_tf_editor)
      visit '/tf/actor/listActors.seam'
    }

    it 'can see document sections linked to an Aipo', :js => true do
      find(:xpath,"//img[@alt='viewActor119']").click  ## The image is found the the click does nothing
      page.should have_content('Edit')
      end
      
  end
end

page.html

<td>
  <img id="listActorsResultsForm:actorList:1:viewActionImage" src="/TM/img/icons64/kfind.gif" alt="viewActor119" height="28" onclick="A4J.AJAX.Submit('listActorsResultsForm',event,{'similarityGroupingId':'listActorsResultsForm:actorList:1:j_id712','parameters':{'listActorsResultsForm:actorList:1:j_id712':'listActorsResultsForm:actorList:1:j_id712'} } )" style="cursor:pointer;" title="Voir" width="28">
</td>

spec_helper.rb

require 'rspec'
require 'capybara'

module CapybaraStandalone
  def self.setup
    Capybara.configure do |config|
      config.app_host       = 'http://localhost:8080/TM'
      config.run_server     = false
      config.default_driver = :selenium
     # config.javascript_driver = :webkit
     end
  end
end

Dir["./spec/helpers/*.rb"].each {|f| require f}

RSpec.configure do |config|
  config.include Capybara::DSL
  config.include User

  config.before(:all) do
    CapybaraStandalone.setup
  end
  config.after do
    Capybara.reset_sessions!
    Capybara.use_default_driver
  end
end