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    copied!<p>I am adding the final answer here, for the sake of ensuring that every one sees the answer I chose (i.e, for the greater good).</p> <p>This answer is inspired by GraphicO, with modifications:</p> <p>The HTML:</p> <pre><code>&lt;nav&gt; &lt;ul class="main-menu" &gt; &lt;li id="item1"&gt; &lt;a href="#"&gt;item 1&lt;/a&gt; &lt;div&gt; &lt;ul class="sub-menu"&gt; &lt;li id="item11"&gt; &lt;a href="#"&gt;item 1.1&lt;/a&gt; &lt;/li&gt; &lt;li id="item12"&gt; &lt;a href="#"&gt;item 1.2&lt;/a&gt; &lt;/li&gt; &lt;li id="item13"&gt; &lt;a href="#"&gt;item 1.3&lt;/a&gt; &lt;/li&gt; &lt;/ul&gt; &lt;/div&gt; &lt;/li&gt; &lt;li id="item2"&gt; &lt;a href="#"&gt;item 2&lt;/a&gt; &lt;div&gt; &lt;ul class="sub-menu"&gt; &lt;li id="item21"&gt; &lt;a href="#"&gt;item 2.1&lt;/a&gt; &lt;/li&gt; &lt;li id="item22"&gt; &lt;a href="#"&gt;item 2.2&lt;/a&gt; &lt;/li&gt; &lt;/ul&gt; &lt;/div&gt; &lt;/li&gt; &lt;li id="item3"&gt; &lt;a href="#"&gt;item 3&lt;/a&gt; &lt;/li&gt; &lt;/ul&gt; &lt;/nav&gt; </code></pre> <p>Then, the CSS:</p> <pre><code>a { color: black; text-decoration: none; } nav { position: relative; width: 100%; background-color: red; } .main-menu { margin: 0 auto; width: 1024px; list-style: none; } .main-menu &gt; li { display: inline-block; margin-right: 2em; } .main-menu &gt; li.selected { background-color: yellow; } .main-menu &gt; li &gt; div { /* nested div (containing the sub nav) will be hidden by default */ width: 100%; position: absolute; left: 0; background-color: yellow; display:none; } .main-menu &gt; li.selected &gt; div { display: inline; } .sub-menu { list-style: none; margin: 0 auto; width: 1024px; } .sub-menu &gt; li { display: inline-block; margin-right: 2em; } </code></pre> <p>And finally the jQuery:</p> <pre><code>// Make the first class selected $(".main-menu &gt; li:first").addClass("selected"); // Switch the selected class $(".main-menu &gt; li").click(function() { $(".selected").removeClass("selected"); $(this).addClass("selected"); }); // Disable menu links $(".main-menu &gt; li &gt; a").click(function(e) { e.preventDefault(); }); </code></pre> <p>Thanks.</p>
 

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