jquery datepicker ms ajax updatepanel doesn't work after post back

<script type="text/javascript">
    $(function() {
        $(".mydatepickerclass").datepicker({dateFormat: 'dd-mm-yy'});
    });
</script>

<asp:UpdatePanel ID="HistoryUpdatePanel" runat="server">
<ContentTemplate>
    <%-- Start of Company History section --%>
    <fieldset>
        <legend>Activity History</legend>

           <script type="text/javascript">
              $(function() {
              $(".mydatepickerclass").datepicker({dateFormat: 'dd-mm-yy'});
              });
           </script>

        <div>
            <asp:ListBox ID="listBoxHistoryTypes" runat="server" SelectionMode="Multiple" AutoPostBack="true" OnSelectedIndexChanged="listBoxHistoryTypes_IndexChanged" />
            <label>Date From:</label><asp:TextBox class="mydatepickerclass" ID="txtdatefrom" runat="server" />
            <label>Date To:</label><input class="mydatepickerclass" type="text" />
            <asp:TextBox class="mydatepickerclass" ID="txtdateto" runat="server" />
            <asp:Button ID="btnFilterSearch" runat="server" Text="Filter Results" OnClick="btnFilterSearch_Click" />
        </div>


    </fieldset>
</ContentTemplate>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <script type="text/javascript" src="http://jqueryjs.googlecode.com/files/jquery-1.3.1.js">
    </script>
    <script type="text/javascript">
        $(document).ready(function() {
            Sys.WebForms.PageRequestManager.getInstance().add_endRequest(EndRequestHandler);

            function EndRequestHandler(sender, args) {
                $('.mydatepickerclass').datepicker({ dateFormat: 'dd-mm-yy' });
            }

        });
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>

    </div>
    <asp:ScriptManager ID="ScriptManager1" runat="server">
    </asp:ScriptManager>
    <asp:UpdatePanel ID="UpdatePanel1" runat="server">
        <ContentTemplate>
            <asp:TextBox ID="TextBox1" runat="server" CssClass="mydatepickerclass"></asp:TextBox>
            <br />
            <asp:Button ID="Button1" runat="server" Text="UpdateMe"
                onclick="Button1_Click" />
        </ContentTemplate>
    </asp:UpdatePanel>
    </form>
</body>
</html>