title: How to call a function after a fadeOut() on many elements
body: <p>I have this code :</p>
  
  <pre><code>$('.hotel_photo_select').fadeOut(500, function () {
      alert("Now all '.hotel_photo_select are hidden'");
  });
  </code></pre>
  
  <p>and I'd like to call that alert only when <strong>ALL</strong> <code>.hotel_photo_select</code> are fadeOuted (so, Hidden).</p>
  
  <p>How can I do it? With my code the alert is called after the first element is fadeout...</p>