<script type="text/javascript" src="jquery.min.js"></script>
<script type="text/javascript" src="jquery.date_input.js"></script>
<link rel="stylesheet" href="date_input.css" type="text/css">
<script type="text/javascript">$($.date_input.initialize);</script>
<form action="#">
<p>
<input type="text" name="date" class="date_input">
</p>
</form>