图片被遮挡的问题，急急，在线等

Question

<div>里的
<table>下
    div里的ul，li下面的
        5个dt下的内容，被同一个div里的div下的iframe里的背景图（背景色）遮挡，试过不添加任何背景图，色，就会显示全 
用z-index不行，有别的办法吗

Answer 1

[<div id="TopWin"> 
        <table id="Table1" cellpadding="0" cellspacing="0" runat="server" style="width:100%;height:45px;background:URL(Images/TopNew/title-bg.png) repeat-x;">
            <tr>
                <td style="width:500px;background:URL(Images/Top/Product.png) no-repeat;"></td>                
                <td>                
                    <asp:UpdatePanel ID="UpdatePanel1" runat="server">                 
                    <ContentTemplate>  
                    <table id="Table2" cellpadding="0" cellspacing="0" border="0" runat="server">
                        <tr style="height:15;">
                            <td>                                
                                <textarea cols="1" rows="1" id="txtareaBulletinTopic" runat="server" style="overflow:hidden; width:100%; height:15px; border:0; background-color:Transparent; text-align:left; padding:0 0 0 0; color:Red;" readonly="readonly">  </textarea>                                 
                            </td>
                        </tr>  
                        <tr style="height:30;">
                            <td>                                
                                <textarea cols="1" rows="2" id="txtareaBulletinContent" runat="server" style="overflow:hidden; width:100%;height:30px;border:0;background-color:Transparent; text-align:left; padding:0 0 0 0;  color:Red;" readonly="readonly">  </textarea>                                
                            </td>
                        </tr>                  
                    </table> 
                    </ContentTemplate>  
                    <Triggers>
                        <asp:AsyncPostBackTrigger ControlID="BulletinTimer" EventName="Tick"/>
                    </Triggers>                                              
                    </asp:UpdatePanel>                  
                </td>                         
                <td style="width:160px;">                                        
                    <table border="1" style="width:160px;">
                        <tr>
                            <td colspan="2"class="hellomessage"><div class="Tmessage">欢迎访问本系统，<% CSystemMenu();%></div></td>
                         </tr>
                        <tr>
                            <td style="width:40px;">
                            <div class="showmore"> <a></a></div><input type="hidden" id="LogState" value="<% LoginState();%>"/>
                            </td>
                            <td style="width:120px;">                                <div>
                                    <ul class="SysMenu">
                                        <li onmouseover="fnNav(this,'block')"onmouseout="fnNav(this,'none')">
                                        <a class="title">系统菜单</a>
                                        <dl class="SysM_child">
                                            <dt title="vis"><a onclick="DirectToURL('ModifyPassword.aspx')">修改密码</a></dt>
                                            <dt><a onclick="DirectToURL('OpenCustomMenu.htm')">打开收藏</a></dt>
                                            <dt title="vis"><a onclick="DirectToURL('ManageCustom.aspx')">管理收藏</a></dt>
                                            <dt title="vis"><a onclick="DirectToURL('OpenSystemMenu.htm')">系统管理</a></dt>
                                            <dt><a onclick="DirectToURL('OpenSystemMenu.htm')">系统帮助</a></dt>
                                        </dl>
                                        </li>
                                    </ul>
                                </div>
                             </td>
                        </tr>
                    </table>                  
                </td>
              </tr>            
          </table>                          
          <% CreateMenu();%>
    </div>

Answer 2

dt被<% CreateMenu();%>
里的背景图遮挡，CreateMenu();下有  
div id='containDiv' class='containDiv'>
 <iframe id='zg_Iframe' class='maskIframe'></iframe>";
      <div id='AOPTopMenu' class='TopMenuBar'>
……
下面对应代码省略，背景图在class 'TopMenuBar'下定义的：
.TopMenuBar /*  一级菜单栏  */
 {
     font-family: 宋体;
     font-size: 12px;
     height:32px;
     /* background-color:#001f83;一级菜单条的背景色*/
     background :URL(../Images/TopNew/menu-bg.png) repeat-x;
     position:absolute; 
     left:0px; /*下滑框距左多少*/
     top:20px; /* 下滑框距上多少 */  
     margin-left:0px;
     width:1440px;
}