请高手指教下

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<HTML>
<HEAD>
<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html" %>
<%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean" %>
<%@ page 
language="java"
contentType="text/html; charset=GB2312"
pageEncoding="GB2312"
%>
<%@ page import="com.web.util.PageUrlManage"%>
<META http-equiv="Content-Type" content="text/html; charset=GB18030">
<META name="GENERATOR" content="IBM WebSphere Studio">
<script language=javascript src="<%=request.getContextPath()%>/js/univerify.js"></script>
<script language=javascript src="<%=request.getContextPath()%>/js/layer.js"></script>
<style type="text/css">
<!--
body { 
margin-left: 0px;
margin-top: 0px;
margin-right: 0px;
margin-bottom: 0px;
}
td    { font-size: 12px}
.STYLE1 {
font-size: 36px;
font-weight: bold;
}
-->
</style>
<TITLE>用户登录</TITLE>
</HEAD>
<body leftmargin="0" topmargin="0" marginwidth="0" marginheight="0">
<%
if(request.getSession().getAttribute("LOGIN_USER")!=null){
session.setAttribute("PAGE_MANAGE",null);
if(request.getParameter("login")!=null)
out.println("<script language=javascript>location.href='default.jsp';</script>");
}
%>
<form method="post" action="UserServlet" onSubmit="return verifyAll(this)"> 
<table width="100%" height="100%" border="0" cellpadding="0" cellspacing="0">
  <tr>
    <td align="center">
<table width="768" border="0" align="center" cellpadding="0" cellspacing="1">
        <tr>
          <td width="766" height="431">
           <table width="100%" height="100%" border="0" align="center" cellpadding="0" cellspacing="0" >
             <tr> 
                <td height="20"></td>
              </tr>
              <tr> 
                <td height="324"align="center" ><span class="STYLE1">连锁店管理系统</span></td>
              </tr>
              <tr> 
                <td height="5%"></td>
              </tr>
             <tr> 
                <td height="30"><div align="center" >
                
                用户名：
                <input name="userId" nullable="no" datatype="text" chname="用户名">
                      &nbsp;
              密码：
                <input type="password" name="userPwd" nullable="no"  chname="密码">
                      &nbsp;
                      <input  value="登录" type="submit">
                      <input name="actionType" value="login" type="hidden">
                </div>
                </td>
              </tr>             
              
            </table> 
          </td>
        </tr>
      </table>
 
    
      </td>
  </tr>
</table>
</form>
</html>
运行这个页面，为什么总是不会跳转？总是回到这个页面