show/hide div when input field is empty(jquery, javascript)
<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>