How to use this jquery inside webusercontrol?

<%@ Control Language="VB" AutoEventWireup="false" CodeFile="WebUserControl.ascx.vb" Inherits="WebUserControl" %>
<script src="scripts/jquery-1.5.1.js" type="text/javascript"></script>
    <script type="text/javascript">
        $(document).ready(function() {
            $('#chkAll').click(
             function() {
                 $("INPUT[type='checkbox']").attr('checked', $('#chkAll').is(':checked'));
             });
         });    

 开发者_JS百科    </script>


        <div>
        <asp:CheckBox ID="chkAll" runat="server" />
        <asp:CheckBox ID="CheckBox2" runat="server" />
    </div>

Probably control ID is changed. Try

$('#<%=chkAll.ClientID%>')