父窗体刷新子窗体

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="AutoRefresh.aspx.cs" Inherits="AutoRefresh" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <script   language= "javascript " type="text/javascript">
        function aa() {
            window.location.href = window.location.href;
            window.open('http://sz.58.com/danbaobaoxiantouzi/5615743316226x.shtml', 'ch');
            ch.location.reload();
            setTimeout('aa()', 20000);
        }

    </script>
</head>
<body onload="aa()">
    <form id="form1" runat="server">
    <div>

    </div>
    </form>
</body>
</html>