title: show/hide div when input field is empty(jquery, javascript)
body: <p>I have a <code>div</code> with content, hide on default and I want to show it, when user input, in the input field which is <code>#control</code>.</p>
  
  <pre><code>&lt;form&gt;
  &lt;input name="control" value="" id="control" /&gt;
  &lt;div class="show_hide"&gt;
    //some content here........
  &lt;/div&gt;
  &lt;/form&gt;
  </code></pre>