title: Wordpress : Remove "sub-menu" class in UL
body: <p>I am trying to convert HTML to Wordpress and I am having troubles with menus.</p>
  
  <p>The menu is a 3 level drop-down menu, I am outputting it with wp_nav_menu and this is how it formats.</p>
  
  <pre><code>    &lt;ul id="nav" class="sf-menu"&gt;
           &lt;li&gt;Home&lt;/li&gt;
           &lt;li&gt;Blog&lt;/li&gt;
               &lt;ul class="sub-menu"&gt;
                   &lt;li&gt;Level 2&lt;/li&gt;
                       &lt;ul class="sub-menu"&gt;
                           &lt;li&gt;Level 3&lt;/li&gt;
                       &lt;/ul&gt;
               &lt;/ul&gt;
           &lt;li&gt;Portfolio&lt;/li&gt;
           &lt;li&gt;Contacts&lt;/li&gt;
      &lt;/ul&gt;
  </code></pre>
  
  <p>Basically I want to remove the "sub-menu" class from the /s in the 2nd level and 3rd level.</p>
  
  <p>This is how I want it to be:</p>
  
  <pre><code>     &lt;ul id="nav" class="sf-menu"&gt;
           &lt;li&gt;Home&lt;/li&gt;
           &lt;li&gt;Blog&lt;/li&gt;
               &lt;ul&gt;
                   &lt;li&gt;Level 2&lt;/li&gt;
                       &lt;ul&gt;
                           &lt;li&gt;Level 3&lt;/li&gt;
                       &lt;/ul&gt;
               &lt;/ul&gt;
           &lt;li&gt;Portfolio&lt;/li&gt;
           &lt;li&gt;Contacts&lt;/li&gt;
      &lt;/ul&gt;
  </code></pre>
  
  <p>Is this possible to do with a custom walker class?</p>