title: How can I do sub selects on already selected element?
body: <p>Markup:</p>
  
  <pre><code>&lt;div class="foo"&gt;
      &lt;img src="loading.gif" class="loading" style="display: none;" /&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>Js:</p>
  
  <pre><code>$("div[class='foo']").click(function(e) {
      e.preventDefault();
      $(this).hide();
      $(/* somehow select the loading img of exactly this div with class foo (not others) */).show();
  });
  </code></pre>