Javascript 控制tr是否显示

<asp:GridView ID="GridViewRestricted" CssClass="bigTabList" Width="750px" runat="server"
                    AutoGenerateColumns="false" OnRowDataBound="GridViewRestricted_RowDataBound">
                    <Columns>
                    <asp:TemplateField HeaderText = "Restricted Documents">
                        <ItemTemplate>
                            <table border="0" cellpadding="0" cellspacing="0">
                                <tr>
                                    <td style='font-size:13px; width:20px;'>
                                        <asp:CheckBox ID="CheckBoxFolder" runat="server" /> 
                                    </td>
                                   <td style="cursor:pointer;width:60px; text-align:left;" onclick="DisplayFiles(this);">Collapse</td> 
<td onclick="parentNode.nextSibling.style.display='none';">Collapse</td>
                                   <td >
                                       <asp:Literal ID="LiteralFolder" runat="server"></asp:Literal>
                                   </td>                                    
                                </tr>
                                <tr style="display:block;">
                                    <td colspan="3">
                                        <asp:Literal ID="LiteralContent" runat="server"></asp:Literal>
                                    </td>
                                </tr>
                                
                            </table>
                        </ItemTemplate>
                    </asp:TemplateField>
                    </Columns>
                </asp:GridView>

 

 

<script language="javascript">
   
   function DisplayFiles(td)
   {
        if (td.parentNode.nextSibling.style.display != "none")
       { 
            td.parentNode.nextSibling.style.display='none';
            td.innerHTML = "Expand"; 
       } 
       else
       {
            td.parentNode.nextSibling.style.display='block';
           td.innerHTML = "Collapse";  
       }
       
   }
   
   </script>