Global checkboxes for grid so that when above chkbox selected below all will get selected.

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Below is my code for grid, i want to give global chkboxes so when above chboxes selected below chkbox will get selecetd automatically?

<div class="srchBxUserRights" id="GridDisplay" style="display: none;">
                <asp:GridView ID="gvParentGrid" ShowHeaderWhenEmpty="true" runat="server" DataKeyNames="ui_name" Width="100%"
                    AutoGenerateColumns="false" OnRowDataBound="gvParent_RowDataBound" GridLines="none" ShowHeader="false" >
                    <HeaderStyle Height="0px" HorizontalAlign="Center" Font-Size="5px" VerticalAlign="Middle"></HeaderStyle>
                    <rowstyle cssclass="DG_ItemStyle" horizontalalign="left" verticalalign="Middle" />
                    <alternatingrowstyle cssclass="DG_ItemStyle" horizontalalign="left" verticalalign="Middle" />
                    <columns>
                    <asp:TemplateField ItemStyle-Width="0px">
                            <itemtemplate>
                           <%-- <a href="java<!-- no -->script:divexpandcollapse('div<%# Eval(" id=") %>');">
                                <img id="imgdiv<%# Eval("ID") %>" width="9px" border="0" src="../../images/drop1.gif" />
                            </a>--%>
                            </itemtemplate>

                        <asp:BoundField DataField="UI_NAME" HeaderText="UI_NAME" HeaderStyle-HorizontalAlign="Left" ItemStyle-Font-Bold="true"/>
                        <asp:BoundField DataField="ID" ItemStyle-Font-Size="1px" HeaderStyle-HorizontalAlign="Left" />
                        <asp:TemplateField>
                            <itemtemplate>
                            <tr>
                            <td colspan="100%">
                            <div id="div<%# Eval(" style="display: BLOCK; removed: relative; removed 15px; overflow: auto;">
                                 <asp:GridView ID="gvChildGrid" runat="server" OnRowDataBound="gvChild_RowDataBound" AutoGenerateColumns="false" GridLines="none"  Width="650px" >
                                <HeaderStyle Height="32px" CssClass="DG_ChildHeaderStyle" Font-Bold="true" HorizontalAlign="Center" VerticalAlign="Middle"></HeaderStyle>
                                <rowstyle cssclass="DG_ItemStyle" horizontalalign="left" verticalalign="Middle" />
                                <alternatingrowstyle cssclass="DG_AlternateItemStyle" horizontalalign="left" verticalalign="Middle" />
                                <columns>
                                    <asp:BoundField DataField="UI_NAME" HeaderText="" HeaderStyle-HorizontalAlign="Left" ItemStyle-Width="20%" />
                                     <asp:TemplateField HeaderText="Access" HeaderStyle-HorizontalAlign="Left" >
                                        <itemtemplate>
                                            <asp:CheckBox runat="server" ID="ui_access" />
                                        </itemtemplate>

                                     <asp:TemplateField HeaderText="Add" HeaderStyle-HorizontalAlign="Left" >
                                        <itemtemplate>
                                            <asp:CheckBox runat="server" ID="ui_add" />
                                        </itemtemplate>

                                    <asp:TemplateField HeaderText="Edit" HeaderStyle-HorizontalAlign="Left" >
                                        <itemtemplate>
                                            <asp:CheckBox runat="server" ID="ui_edit" />
                                        </itemtemplate>
                                    </columns></div></td></tr></itemtemplate></columns></div>