title: How to open content box with hash #popup in jQuery
body: <p>Here is the basic HTML markup.</p>
  
  <pre><code>&lt;a id="open" href="#popup"&gt;click&lt;/a&gt;
  &lt;div id="popup"&gt;content&lt;/div&gt;
  </code></pre>
  
  <p>I've made <code>&lt;div id="popup"&gt;</code> hidden by default, and click on <code>&lt;a id="open"&gt;</code> to open <code>&lt;div id="popup"&gt;</code>.</p>
  
  <p>Can I have it defaults to open if user entered the URL with the hash tag <code>#popup</code> i.e. <code>example.com/#popup</code>?</p>