Untitled

<html>
  <head>
    <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js" type="text/javascript">
    </script>
    <script type="text/javascript">
var changePic = function() {
  document.images[0].setAttribute('src', 'https://lh6.googleusercontent.com/-N6O_V0hFg0g/Swh-HsX_HTI/AAAAAAAABN8/Rx9xqQyHnik/s640/IMG_7667.JPG');
}
    </script>
  </head>
  <body>
    <h1 id='header'>
      <a id='link' href='#' onclick=changeMe();'>Click me</a>
    </h1>
    <img id='pic'
         src="https://lh6.googleusercontent.com/-_RTlISCDQ8s/SQjyClFH1qI/AAAAAAAAAoo/nOTH9PhRzHM/s640/IMG_7015.JPG"
         onclick="changePic();"/>
    </script>
  </body>
</html>