Javascript验证Struts登录控件

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<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib uri="http://struts.apache.org/tags-bean" prefix="bean" %>
<%@ taglib uri="http://struts.apache.org/tags-html" prefix="html" %>
<%@ taglib uri="http://struts.apache.org/tags-logic" prefix="logic" %>
<%@ taglib uri="http://struts.apache.org/tags-tiles" prefix="tiles" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>


<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html:html>
  <head>
   
    <title>XX网</title>
 <meta http-equiv="pragma" content="no-cache">
 <meta http-equiv="cache-control" content="no-cache">
 <meta http-equiv="expires" content="0">   
 <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
 <meta http-equiv="description" content="This is my page">
 <!--
 <link rel="stylesheet" type="text/css" href="styles.css">
 -->
 
 <script type="text/javascript">
  function check()
   {
      if(document.getElementById("login").value=="" || document.getElementById("password").value=="")
      {
        alert("用户名和密码不能为空!");
        return false;
      }
   return true;
  }

 </script>
  </head>
 
  <body>
    <html:form action="/login_user" method="post" onsubmit="return check()">
      <table border="0">
        <tr>
          <td>usertype:</td>
          <td><html:select property="usertype" style="width:180px" >
                 <html:option value="personal" >个人用户</html:option>
                 <html:option value="company" >企业用户</html:option>          
           </html:select>
          </td>
         </tr>
        <tr>
          <td>Login:</td>
          <td><html:text property="login" style="width:180px" /></td>
        </tr>
        <tr>
          <td>Password:</td>
          <td><html:password property="password" style="width:180px" /></td>
        </tr>
        <tr>
          <td colspan="2" align="center">
             <html:button value="个人注册" property="reg" onclick="javascript:window.location.href='reg_personal.jsp'"/>
             <html:button value="企业注册" property="reg" onclick="javascript:window.location.href='Company/reg_company.jsp'"/>
           <html:submit style="width:80px" >登录</html:submit>
         </td>
        </tr>
      </table>
    </html:form>
  </body>
</html:html>