title: How can I move selected option in multiselect up and down by buttons using jquery?
body: <p>I have select</p>
  
  <pre><code>&lt;select multiple id="select2"&gt; 
       &lt;option value="1"&gt;1&lt;/option&gt; 
       &lt;option value="2"&gt;2&lt;/option&gt; 
       &lt;option value="3"&gt;3&lt;/option&gt;
  &lt;/select&gt;
  </code></pre>
  
  <p>And two buttons</p>
  
  <pre><code>&lt;input type="button" value="Up" onclick="up()"&gt;
  &lt;input type="button" value="Down" onclick="down()"&gt;
  </code></pre>
  
  <p>How can I move selected option in multiselect up and down by buttons using jquery?</p>