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I am getting error in Jquery as 'null' or not an object.
I have declared the div tag values in jquery. but, still it is getting null object.
see my code below.
Master Page
<html xmlns="">
<head runat="server">
    <link type="text/css" rel="Stylesheet" href="Styles/Home.css" />
    <asp:ContentPlaceHolder ID="paneContentPlace" runat="server">


<asp:Content ID="Content3" ContentPlaceHolderID="paneContentPlace" runat="Server">
        <script language="javascript" type="text/javascript">
            $(document).ready(function () {
                $("div.ContainerPanel").toggle(   /*********** Error Place ('null' or not null object)******/
                function () {
                    $(this).attr("class", "ArrowClose");
                alert("Hello Word");
        <style type="text/css">
 border-style:double double double double;
    width: 400px;
    height: 30px;
    background-image: url('../images/bg-menu-main.png');
    background-repeat: repeat-x;
    color: #FFF;
    font-weight: bold;
    background-image: url('../images/expand_blue.jpg');
    width: 13px;
    height: 13px;
    float: right;
    margin-top: 7px;
    margin-right: 5px;
    background-image: url('../images/collapse_blue.jpg');
    width: 13px;
    height: 13px;
    float: right;
    margin-top: 7px;
    margin-right: 5px;
  <asp:UpdatePanel ID="upnl1" runat="server">
                <div id="ContainerPanel" class="ContainerPanel">
                    <div id="header" class="collapsePanelHeader">
                        <div id="dvHeaderText" class="HeaderContent">
                            jQuery Collapsible Panel1</div>
                        <div id="dvArrow" class="ArrowExpand">
                    <div id="dvContent" class="Content" style="display: none">
                        In Album List Page, we will display 3 albums in a row in Tiled format i.e. to repeat
                        In our case, it is LastItem.
                <br />
                <div id="Div1" class="ContainerPanel">
                    <div id="Div2" class="collapsePanelHeader">
                        <div id="Div11" class="HeaderContent">
                            jQuery Collapsible Panel2</div>
                        <div id="Div3" class="ArrowExpand">
                    <div class="Content" style="display: none">
Posted 22-Mar-13 0:15am
Updated 22-Mar-13 0:23am
Shubhashish_Mandal 22-Mar-13 7:59am
In which explorer you have got this error?

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