title: Disappears tab that shall be visible
body: <p>Once I click on the title of the menu <code>a</code>, the bottom tab is displayed <code>#sub_backbone</code> or <code>#sub_backbone_center</code> <code>#sub_backbone_end</code> depending on the location of the button:
  Here's the code:</p>
  
  <pre><code>/*After hover link show me the menu*/
  div#menu ul li a:hover + #sub_backbone,
  div#menu ul li a:hover + #sub_backbone_center,
  div#menu ul li a:hover + #sub_backbone_end{
      opacity: 1;
  }
  </code></pre>
  
  <p>But after I am bringing mouse on the tab <code>#sub_backbone</code> ... it disappears but should not disappear, there will be an additional menu. 
  Ie when selecting a title, the tab should not disappear when I drive my mouse over it.
  How can solve this situation?</p>