<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Navigation API</title>
  <style>
    #maincontent {
      float: left;
      padding: 20px;
      border: 1px solid #999999;
    }
    #databox {
      float: left;
      width: 500px;
      margin-left: 20px;
      padding: 20px;
      border: 1px solid #999999;
    }
    #maincontent span {
      color: #0000FF;
      cursor: pointer;
    }
  </style>
  <script src="navigation.js"></script>
</head>
<body>
  <section id="maincontent">
    <p><span id="url1">image 1</span></p>
    <p><span id="url2">image 2</span></p>
    <p><span id="url3">image 3</span></p>
    <p><span id="url4">image 4</span></p>
  </section>
  <aside id="databox">
    <img id="image" src="monster1.jpg" alt="Monster">
  </aside>
</body>
</html>