title: Opposite of append in jQuery
body: <p>I use <code>.append</code> to add to a div</p>
  <pre><code>$(this).append('&lt;ul&gt;&lt;li&gt;test&lt;/li&gt;&lt;/ul&gt;');
  </code></pre>
  <p>how can I search for a <code>&lt;ul&gt;</code> and remove it if it exists in the children of <code>$(this)</code>?</p>