title: How to check the status each 10 seconds with JavaScript?
body: <p>I have a server (<em>mysite.com/status</em>), which returns number of active tasks (just a single integer).
  How can I check number of active tasks each 10 seconds with JavaScript and show user something like:</p>
  
  <blockquote>
    <p>Number of remaining tasks: XXX</p>
  </blockquote>
  
  <p>And, if number of tasks is 0, then I should load another page.</p>