title: How to add konami code in a website based on html?
body: <p>I was asked to implement the Konami Code
   in a website I'm currently working on. It should do the following:</p>
  
  <ol>
  <li><p>Change Background Image</p></li>
  <li><p>Play sound</p></li>
  <li><p>Bring some pop-up</p></li>
  </ol>
  
  <p>What's the easiest way to achieve this using javascript?</p>