jQuery - Tabs inside of tabs?

Question

I'm trying to arrange tabs inside of tabs using jQuery. Below is the HTML, CSS, and JS that I'm using. How can I insert a couple tabs within #tab2?

HTML

<ul class="tabs">
  <li><a href="#tab1">Podcasts</a></li>
  <li><a href="#tab2">Videos</a></li>
</ul>
<div id="tab1" class="tab_content">
  <p>test</p>
</div>
<div id="tab2" class="tab_content">
  <div id="tab2-1">                      <-- Tab 2-1 inside of #tab2
    <p>test</p>
  </div>
  <div id="tab2-2">                      <-- Tab 2-2 inside of #tab2
    <p>test</p>
  </div>
</div>

CSS

.tab_content { background:#fff;padding:10px;width:100% }
.tabs li { display:inline;list-style:none }
.tabs a { background:#7c7c7c;color:#dadada;display:inline-block }
.tabs a.active { background:#e32d2d;color:#fff }

JS

jQuery('ul.tabs').each(function(){
    // For each set of tabs, we want to keep track of
    // which tab is active and it's associated content
    var $active, $content, $links = jQuery(this).find('a');

    // If the location.hash matches one of the links, use that as the active tab.
    // If no match is found, use the first link as the initial active tab.
    $active = jQuery($links.filter('[href="'+location.hash+'"]')[0] || $links[0]);
    $active.addClass('active');

    $content = $($active[0].hash);

    // Hide the remaining content
    $links.not($active).each(function () {
        jQuery(this.hash).hide();
    });

    // Bind the click event handler
    jQuery(this).on('click', 'a', function(e){
        // Make the old tab inactive.
        $active.removeClass('active');
        $content.hide();

        // Update the variables with the new link and content
        $active = jQuery(this);
        $content = jQuery(this.hash);

        // Make the tab active.
        $active.addClass('active');
        $content.show();

        // Prevent the anchor's default click action
        e.preventDefault();
    });
});

Answer 1

Try this,

<ul class="tabs">
    <li><a href="#tab1">Podcasts</a></li>
    <li><a href="#tab2">Videos</a></li>
</ul>
<div id="tab1" class="tab_content">
    <p>test</p>
</div>
<div id="tab2" class="tab_content">
    <ul class="tabs">   <!-- Add tabs here -->
        <li><a href="#tab2-1">Tab2-1</a></li>
        <li><a href="#tab2-2">Tab2-2</a></li>
    </ul>
    <div id="tab2-1">
        <p>test 1</p>
    </div>
    <div id="tab2-2">
        <p>test 2</p>
    </div>
</div>

Live Demo