js 跳出frameset框架

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框架页面（system_index.jsp）：

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
   String path = request.getContextPath();
   String basePath = request.getScheme() + "://"
           + request.getServerName() + ":" + request.getServerPort()
           + path + "/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">

<title>天津市档案局业务指导平台</title>

</head>
<FRAMESET border=0 frameSpacing=0 rows="75,*" frameBorder=0>
   <FRAME name=header src="<%=basePath%>/system/top.jsp" frameBorder=0
       noresize="noresize" scrolling=no>
   <FRAMESET cols="199,*">
       <FRAME name=menu src="<%=basePath%>/system/left.jsp" frameBorder=0 noresize="noresize"
           scrolling="auto">
       <FRAME name=main src="<%=basePath%>/system/first.jsp" frameBorder=0 noresize="noresize"
           scrolling="auto">
   </FRAMESET>
</FRAMESET>
<noframes>
</noframes>
<body></body>
    </noframes>
</html>

top页面(top.jsp):

<%@ page language="java"
   import="java.util.*,com.businessguidance.common.pojo.*"
   pageEncoding="utf-8"%>
<%@ taglib uri="/struts-tags" prefix="s"%>
<%
   String path = request.getContextPath();
   String basePath = request.getScheme() + "://"
           + request.getServerName() + ":" + request.getServerPort()
           + path + "/";
%>

<style type="text/css">
body {
   margin: 0;
   padding: 0;
   background-color: #2e7ba5;
}

a {
   text-decoration: none;
   font-family: 微软雅黑;
   font-size: 13px;
   color: #FFFFFF;
}

.top {
   width: 100%;
   height: 75px;
   background: url(images/r1_c1.jpg);
   background-repeat: no-repeat;
}

.STYLE1 {
   float: right;
   margin-top: 38px;
   margin-right: 18px;
   height: 75px;
   font-size: 13px;
   color: #FFFFFF;
}
</style>
<%
   Public_Reguserinfo user = null;
   Object pr = session.getAttribute("user");
   if (pr != null) {
       user = (Public_Reguserinfo) pr;
   } else {
       out.println("<script>window.parent.open('../index.jsp','_self');</script>");
   }
%>

<div class="top">
   <div class="STYLE1">
       <a href="#">
           <%
               if (user != null) {
           %><%=user.getName()%>
           <%
               }
           %>
       </a> | <a href="<%=basePath%>index.jsp" target="_parent">
       <%
               if (user != null) {
           %>
           退出
           <%
               }else{
           %>
           重新登陆
           <%} %>
       </a> |<a
           href="tskjapp://rtx">腾讯通</a>
   </div>
</div>

在top页面中判断session，当session为空的时候，直接跳出当前框架，要执行脚本：

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