为什么我的页面会不停的刷新


<?php include("../login/qx.php") ;?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Frameset//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>
<frameset rows="56,*" cols="*" frameborder="no" border="2" framespacing="2">
  <frame src="top.php" name="topFrame" scrolling="No" noresize="noresize" id="topFrame" title="top" />
  <frameset rows="*" cols="186,*" framespacing="0" frameborder="no" border="0">
    <frame src="lift.html" name="leftFrame" scrolling="No" noresize="noresize" id="leftFrame" title="left" />
    <frame src="mian.html" name="mainFrame" id="mainFrame" title="main" />
  </frameset>
</frameset>
<noframes><body>
</body></noframes>
</html>
其中qx.php的代码是
<?php
session_start();
?>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<?php if (empty($_SESSION['login'])) {
    echo "<script>alert('你没有访问权限，请先登录！');window.location.href='../login/login1.php'</script>";
    exit;
}
else{
 echo "<script>alert('欢迎光临！');window.location.href='../admin/index.php'</script>";
}
?>
那个能帮我解决吗