unable to postback using jquery in asp.net 4

See more:

C#

ASP.NET

C#4.0

jQuery

ASP.NET4

, +

Hi ,
I'm unable to postback using jquery. The code was working fine week ago. I just made few more amendments in the page and checked; now it's unresponsive.

following is the code :
in head

<script src="../../scripts/jquery-1.6.js" type="text/javascript"></script>
	<link href="../../styles/jquery-ui-1.8.17.custom.css" rel="stylesheet" type="text/css" />
	<script src="../../scripts/jquery-ui-1.8.17.custom.min.js" type="text/javascript"></script>
<script src="../../scripts/jquery.jqzoom-core-pack.js" type="text/javascript"></script>
<link rel="stylesheet" href="../../styles/jquery.jqzoom.css" type="text/css"/> 

in content panel :

<table class="ui-accordion">
                                       <tr>
                                           <td>
                                              <p><a href="#" id="dialog_link" class="ui-state-default ui-corner-all"><span class="ui-icon ui-icon-newwin"></span>Contact Information</a></p>
		<!-- ui-dialog -->
        
		<div id="dialog" title="Contact Information">
			<table>
            <tr>
            <td>Phone Number :</td>
            <td><asp:Label ID="lblContact" runat="server" /></td>
            </tr>
            <tr>
            <td>Reply By Email :</td>
            <td>
                <asp:TextBox ID="txtReply" TextMode="MultiLine"  runat="server"></asp:TextBox>
            </td>
            </tr>
            </table>

in code behind :

protected void Page_Load(object sender, EventArgs e)
    {
        if (Request.Form["MethodName"] == "SendReply")
        {
            var a = Request.Form["Reply"].ToString();
            SendReply(a);
        }
..
}

dialog code  in script tag :
 $(document).ready(function () {
         $('#dialog').dialog({
            autoOpen: false,
            modal: true,
            show: "slide",
            width: 600,
            buttons: {
                "Send Mail": function () {
                    var dataToSend = { MethodName: 'SendReply', Reply: document.getElementById('<%= txtReply.ClientID %>').value };
                    var id = $.readQS('productId');
                    var options =
                        {
                            url: '<%=ResolveUrl(string.Format("~/classifieds/details/generalDetails.aspx?productId={0}", Request.QueryString["productId"])) %>',
                            data: dataToSend,
                            dataType: 'JSON',
                            type: 'POST',
                            success: function () { $(this).dialog("close"); }
                        };
                        $.ajax(options);

                        

                },
                "Cancel": function () {
                    $(this).dialog("close");
                }
            }
            });