Capybara cuke drag and drop

drag_and_drop.rb

require 'rubygems'
require 'capybara'
require 'capybara/dsl'

Capybara.run_server = false
Capybara.current_driver = :selenium

class Test
  include Capybara::DSL
  def test_google
    sleep_time = 0.6 # time to see visual effects manually
    visit('http://www.uize.com/examples/drag-to-move.html?tour=drag-and-drop')
    
    #added exception catching for analysing scripts process issues
    begin
      #left = page.evaluate_script("document.getElementById('uizeGuid4').style.left")
      #top = page.evaluate_script("document.getElementById('uizeGuid4').style.top")
      page.execute_script("document.getElementById('uizeGuid4').style.zIndex=100")
      
      while(1)
        [[120,160], [160, 120], [280, 60], [400, 80], 
         [450,150], [430, 220], [350, 280], [230, 250]].each do |left, top|
          page.execute_script("document.getElementById('uizeGuid4').style.left='#{left.to_i+10}px'")
          page.execute_script("document.getElementById('uizeGuid4').style.top='#{top.to_i+10}px'")
          sleep(sleep_time)
        end
      end
      #All the best
    rescue Exception => exp
      puts exp.to_s
    end
  end
end

t = Test.new
t.test_google