jquery calender is not working

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C#

ASP.NET

I have created an application in Asp.net in which I have to used jquery calender. for these I have searched lot of jQuery examples. I got one good solution for this i got one site
"http://keith-wood.name/datepick.html[^]" from here I took two JS and css files.

In a simple page I tried it works fine, but when I implemented this in my project it is not working.

I am not understanding how to implement this.

<%@ Page Title="" Language="C#" MasterPageFile="~/MasterPages/MasterLogin.Master"
    AutoEventWireup="true" CodeBehind="testjquery.aspx.cs" Inherits="PresentationLayer.testjquery" %>

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="ajax" %>
<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolderCheckoutProcess"
    runat="server">

    <script type="text/javascript">
        $(function() {
            //	$.datepick.setDefaults({useThemeRoller: true});
            $('#popupDatepicker').datepick();
            $('#inlineDatepicker').datepick({ onSelect: showDate });
        });

        function showDate(date) {
            alert('The date chosen is ' + date);
        }
</script>

    <script src="js/jquery.datepick.js" type="text/javascript"></script>

    <link href="css/jquery.datepick.css" rel="stylesheet" type="text/css" />

    <script src="js/jquery-1.3.2.js" type="text/javascript"></script>

    <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"></script>

    <div>
        <p>
            A popup datepicker
            <input type="text" id="popupDatepicker"></p>
    </div>
</asp:Content>