IE7中DIV层覆盖，IE6没有问题

Question

A.aspx中引用了MasterPageFile="Project.Master"
Project.Master代码如下
<div id="cont_r3" style="text-align: center">
  <asp:ContentPlaceHolder ID="ContentNavigate" runat="server">
  </asp:ContentPlaceHolder>
  <asp:ContentPlaceHolder ID="ContentMain" runat="server">
  </asp:ContentPlaceHolder>
</div>
其中cont_r3代码：
#cont_r3
{
width: 730px;
float: left;
padding-left: 5px;
background: url(../images/img_js_233.gif) repeat-x;
text-align:center;
}为什么在IE6中能正常显示，IE7中ContentMain这块DIV将内容全部覆盖了呢？

Answer 1

http://www.cnblogs.com/DotNetNuke/archive/2008/11/18/1336004.html