title: Wordpress: add custom ID to ul in wp_nav_menu
body: <p>I am trying to alter the wp_nav_menu to output the html like the below example.</p>
  
  <pre><code>&lt;div class="menu"&gt;
  &lt;ul id="menu"&gt;
  </code></pre>
  
  <p>The original output</p>
  
  <pre><code>&lt;div class="menu"&gt;
  &lt;ul&gt;
  </code></pre>
  
  <p>I cant do it with jQuery or javascript, Its have to be php code</p>