title: jQuery add/remove Class with fadeIn/Out
body: <p>I would to apply a fadeIn effect to a addClass function..and fadeOut to removeClass...</p>
  
  <p>Can you help me?</p>
  
  <p>This is my code</p>
  
  <pre><code>$('#loader'+idTurno).addClass('loader');
  </code></pre>
  
  <p>...</p>
  
  <pre><code>$('#loader'+idTurno).removeClass('loader');
  </code></pre>