If set to true, add header to the datepicker.
Examples
True
<input id="datepicker" width="312" />
<script>
$('#datepicker').datepicker({ header: true, modal: true, footer: true });
</script>
False
<input id="datepicker" width="312" />
<script>
$('#datepicker').datepicker({ header: false });
</script>