页面增添透明浮动层后,服务器端控件无响应

页面添加透明浮动层后,服务器端控件无响应
aspx页面:
我在页面添加了这个层后,页面上的button控件就没任何反应了,高手帮忙解决一下啊<div style="width:900px;border:1px solid white;" id="contentDIV" runat="server">
<!-- 背景滤镜的效果 -->
<div id="message_box_2" style="position:absolute;border:1px solid #666;z-index:1000; visibility:hidden; ">
<div id= "message" style="width:100%; height:100%;background:#fff; color:#036; font-size:12px; line-height:150%;">
<!-- DIV弹出状态行:标题、关闭按钮 -->
<div style="background:#9FB6CD;font-family:Verdana, Arial, Helvetica, sans-serif;font-size:12px; padding:3 5 0 5; color:#fff ; height:30px; line-height:30px;" id="dragDiv">
   
<span style="width:150px;position:absolute;font-size:12px; top: 8px; left: 0px;">&nbsp;&nbsp;
  会签</span>  
  <span onclick="closeProc2();" 
  style="float:right;cursor:pointer;font-size:22px;" >×</span>
<asp:Panel ID="Panel4" runat="server">
  <br />
  <span style="color: #000000">
  <asp:Label runat="server" ID="et" ></asp:Label><br />
  &nbsp;<asp:RadioButton ID="app_y_1" runat="server" Text="同意" Checked="true" GroupName ="approve" />
  &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
  <asp:RadioButton ID="app_n_1" runat="server" GroupName="approve" Text="否决" />
  &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
  <br />
  签署意见:
  <br />
  <asp:TextBox ID="opt1" runat="server" Height="70px" TextMode="MultiLine"  
  Width="327px" CssClass="sug"></asp:TextBox><asp:RequiredFieldValidator ID="RequiredFieldValidator1_1" ForeColor="Red"
  runat="server" ErrorMessage="请填写意见" ControlToValidate="opt1" Display="Dynamic"></asp:RequiredFieldValidator>
  <br />
   
   
  <asp:Button ID="td" runat="server" Text="提交" height="20" Width="60" 
  OnClientClick="javascript:closeProc2()" onclick="td_Click" 
  />
   
  </span>
  </asp:Panel>  
</div>
</div><!-- message -->
</div><!-- message_box -->

------解决方案--------------------
是不是层遮住了下面放按钮的层
------解决方案--------------------
估计是挡住了按钮