求助:DIV+CSS 二级分类重叠

<div class="function_bottom_a">

  <div class="function_mc"></div>

  <div class="function_frame_a"><%<Hi:Common_ProductCategoryList TemplateFile="/ascx/tags/Skin-Common_ProductCategoryList.ascx" runat="server" />%></div>

</div>

<dl class="function_mc_submenu">

  <dt><a href='<%# Globals.GetSiteUrls().SubCategory(Convert.ToInt32(Eval("CategoryId")), Eval("RewriteName")) %>'><%# Eval("Name")%> </a></dt>

  <asp:Repeater ID="rptSubCategries" runat="server" >

<ItemTemplate>

  <dd><a href='<%# Globals.GetSiteUrls().SubCategory(Convert.ToInt32(Eval("CategoryId")), Eval("RewriteName")) %>'><asp:Literal ID="litName" runat="server" Text='<%# Eval("Name")%>'></asp:Literal></a></dd>

</ItemTemplate>

  </asp:Repeater>

</dl>

<div class="function_mc_clearboth"></div>

.function_mc{background:url("../images/Function_Top.gif") no-repeat; background-position:0px 0px; height:36px;}

.function_frame_a{background:url("../images/Function_Frame_A.gif") repeat-y; padding:5px;}

.function_frame_b{border:1px solid #ccc; padding:5px;}

.function_bottom_a{background:url("../images/Function_Bottom_A.gif") no-repeat bottom; padding-bottom:6px;}

.function_bottom_b{background:url("../images/Function_Bottom_B.gif") no-repeat bottom; padding-bottom:6px;}

/*商品分类*/

.function_mc_submenu{background:url("../images/Function_MC_SubMenu.gif") no-repeat; width:180px; height:22px; margin:0px auto; margin-top:12px;}

.function_mc_submenu dt{font-weight:bold; padding-left:22px; word-break:break-all;}

.function_mc_submenu dd{float:left; padding-left:5px; width:84px;}

.function_mc_clearboth{clear:both;}

补充：.NET技术 ,  ASP.NET

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