anchor.diff:  
   let on (u: string) = 
       logAction "on"
  -    let wait = new WebDriverWait(browser, TimeSpan.FromSeconds(10.0))
  +    let wait = new WebDriverWait(browser, TimeSpan.FromSeconds(pageTimeout))
       try
           wait.Until(fun _ -> (browser.Url = u)) |> ignore
       with
  -        | :? Exception -> failwith (System.String.Format("on check failed, expected {0} got {1}", u, browser.Url));
  +        | :? Exception -> failwith (String.Format("on check failed, expected {0} got {1}", u, browser.Url));
       ()
   
   let ( !^ ) (u : string) = 
  
positive.code:     | _ -> browser <- new OpenQA.Selenium.Firefox.FirefoxDriver() :> IWebDriver
      ()
  
  let currentUrl _ =
      browser.Url
  
  
negative.code: 
  let write (cssSelector : string) (text : string) = 
      logAction "write"
      let element = find cssSelector elementTimeout
      element.SendKeys(text)
  
  let ( << ) (cssSelector : string) (text : string) = 
  