i have used your this below code which working fine in http not in https
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.6/jquery.min.js" type="text/javascript"></script>
<script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/jquery-ui.min.js" type="text/javascript"></script>
<link href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/themes/base/jquery-ui.css" rel="Stylesheet" type="text/css" />
<script type="text/javascript">
$(function () {
$("[id$=txtDate]").datepicker({
showOn: 'button',
buttonImageOnly: true,
buttonImage: 'http://jqueryui.com/demos/datepicker/images/calendar.gif'
});
});
</script>
</head>
<body>
<form id="form1" runat="server">
<asp:TextBox ID="txtDate" runat="server" ReadOnly = "true"></asp:TextBox>
<asp:Button ID="btnSubmit" runat="server" Text="Submit"
onclick="btnSubmit_Click" />
</form>
</body>
</html>
