<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
  <title>Moja strona WWW</title>
  <script type="text/javascript">
  </script>
</head>
<body>
  <div id="dataDiv"
       style="background-color:silver;width:200px;heigth:30px;
              text-align:center;"
       onclick="alert('To działa!');"
  >
    To jest treść warstwy.
  </div>
</body>
</html>