<html>
<head>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js"></script>
<script type="text/javascript" src="ex.js"></script>
</head>
<body>
<h1>The page</h1>
<p>
<a id="retrieve-data" href="#">Retrieve data from DB</a>
<div id="result">The result</div>
</p>
</body>
</html>