title: Button disabled with MotionCaptcha
body: <p>Well, I'm from Mexico, so, I'm sorry for my bad English.</p>
  
  <p>I'm doing a form with JQuery Mobile and I'm using MotionCaptcha (http://www.josscrowcroft.com/demos/motioncaptcha/) app. 
  I have a problem with a submit button, it doesn't disabled or enabled itself. At the beginning, the button is disabled (all right), but, if I introduce the right captcha, it doesn't turned into a enabled button until I refresh the captcha. Then, when the button is enabled, and I click on it, it doesn't turned into a disabled button. 
  I have noticed that the problem emerges when I add the JQuery Mobile files.</p>
  
  <p>Someone could tell me why?  </p>