Check -uncheck check boxes in parent chikd datalists

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C#

Hi all,
I have nested datalists and when click on chkbox in parent datalist all the childs of it should be got checked .Similarly when i click on any child check box parent should get unchecked
Can anybody help me in this!!
Thank You for Your reply in Advance.. my nested datalist is

<asp:DataList ID="dst_Make" runat="server" DataKeyField="Make" OnItemCreated="dst_Make_ItemCreated">
            <itemtemplate>
                <asp:CheckBox ID="chkMake" runat="server" 
                    oncheckedchanged="chkMake_CheckedChanged" CssClass="chkHeader" />
                <asp:Label runat="server" Text='<%#DataBinder.Eval(Container, "DataItem.Make").ToString() %>'
                    ID="ltrl_Make_Header" />
                (<asp:Label runat="server" Text='<%#DataBinder.Eval(Container, "DataItem.Count").ToString() %>'
                    ID="ltrl_MakeCount" />)
                <asp:ImageButton ImageUrl="~/Images/misc/expander.jpg" runat="server" ID="imgToggle" />
                <asp:Literal ID="litCount" runat="server" />

                <asp:CollapsiblePanelExtender runat="server" ID="CollapsiblePanelExtender1" TargetControlID="ShowHide"
                    CollapsedSize="0" Collapsed="True" ExpandControlID="imgToggle" CollapseControlID="imgToggle"
                    ExpandedImage="~/Images/misc/collapse.jpg" CollapsedImage="~/Images/misc/expander.jpg"
                    ImageControlID="imgToggle" SuppressPostBack="true" SkinID="CollapsiblePanelDemo">
                
                <asp:Panel ID="ShowHide" runat="server">
                    <asp:CheckBox  Text="Select All" runat="server" AutoPostBack="True"
                        OnCheckedChanged="chkSelectAllModels_CheckedChanged" ID="chkSelectAllModels"  CssClass="chkItem" />
                        <asp:DataList ID="dst_Model" runat="server">
                            <itemtemplate>
                                <asp:CheckBox ID="chkModels" runat="server" CssClass="chkItem" /><asp:Label runat="server" Text='<%#DataBinder.Eval(Container, "DataItem.Model").ToString() %>'
                                    ID="ltrl_Model_Items" />
                                (<asp:Label runat="server" Text='<%#DataBinder.Eval(Container, "DataItem.Count").ToString() %>'
                                    ID="ltrl_ModelCount" />)
                            </itemtemplate>
                        
                
            </itemtemplate>