How to enable/disable dropdownlist through a checkbox selection using Jquery

============Head Tag Of Page==================

 
<script src="Scripts/jquery-1.4.1.js" type="text/javascript"></script>
    <script type="text/javascript">
        $(document).ready(function () {
            $("#chkbox").click(function () {
                if (this.checked)
                    $('#ddlcountry').attr('disabled', 'disabled');
                else
                    $('#ddlcountry').removeAttr('disabled');            });
        });
    </script>




==================Body Tage of Page=================


<asp:CheckBox ID="chkbox" runat="server" Text="Enable/Disable" />
  <asp:DropDownList ID="ddlcountry" runat="server"> 
           <asp:ListItem Text="Select" Value="India"/>
            <asp:ListItem Text="Option1" Value="United States" />
            <asp:ListItem Text="Option2" Value="China" />
            <asp:ListItem Text="Option3" Value="Sri Lanka" />
        </asp:DropDownList>

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