<% @ Control Language="C#" Inherits="PageAdmin.lanmu_style"%>
<div class="main_box main_box_style3">
 <div class="main_box_inner">
   <div class="main_box_inner_left">
     <asp:PlaceHolder id="nav_left" runat="server"/>
   </div>
   <div class="main_box_inner_middle">
     <asp:PlaceHolder id="holder" runat="server"/>
   </div>
   <div class="main_box_inner_right">
    <asp:PlaceHolder id="nav_right" runat="server"/>
   </div>
 </div>
 <div class="clear main_box_inner_bottom"></div>
</div>