如何在jsp里制作弹出窗口??!!(急!~)
[b]我有一个jsp的页面(代码如下),老大让我在[color=#0000FF]点击“登录”时弹出个窗口,要输入相同的人员编号及密码后,界面才可以到下一页,哪位大侠帮下忙!!教教我怎么做!![/b][/color]
<%@ page language="java" pageEncoding="UTF-8"%>
<%@ taglib uri="http://jakarta.apache.org/struts/tags-bean"
	prefix="bean"%>
<%@ taglib uri="http://jakarta.apache.org/struts/tags-html"
	prefix="html"%>
<%@ taglib uri="http://jakarta.apache.org/struts/tags-logic"
	prefix="logic"%>
<%@ taglib uri="http://jakarta.apache.org/struts/tags-tiles"
	prefix="tiles"%>
<%@ taglib uri="http://jakarta.apache.org/struts/tags-template"
	prefix="template"%>
<%@ taglib uri="http://jakarta.apache.org/struts/tags-nested"
	prefix="nested"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%String webpath = request.getContextPath();
			%>
<link rel="stylesheet" type="text/css" media="screen" href="css/qydl.css" />
<HTML>
<HEAD>
<TITLE>用户登录</TITLE>
<style type="text/css">
<!--
.STYLE1 {
	font-family: "黑体";
	font-size: 36px;
	font-weight: bold;
	color: #6F067B;
}
.STYLE2 {
	font-size: 14px;
	font-weight: bold;
	color: #6F067B;
}
-->
</style>
<script language="javascript">
   function checkform(){  
	  if(document.all.userid.value==''){
	       alert("人员号不能为空!");
	       return false;
	   }  
	  if(document.all.userpwd.value==''){
	       alert("登录密码不能为空!");
	       return false;
	   } 	   	     
   }       
</script>  
</HEAD>
<body vLink="#000000" aLink="#6f067b" link="#000000" leftMargin="0" topMargin="0">
<table width="100%" height="100%" border="0" cellpadding="0" cellspacing="0">
   <tr>
     <td align="left" valign="top">
<table width="100%" height="10" border="0" cellpadding="0" cellspacing="0">
   <tr>
     <td background="img/bg1.gif"> </td>
   </tr>
</table>
<table width="100%" height="21" border="0" cellpadding="0" cellspacing="0">
   <tr>
     <td align="right" valign="bottom" background="img/bg1_1.gif"> </td>
   </tr>
</table>
<table width="100%" height="50" border="0" cellpadding="0" cellspacing="0" style="border-bottom:#000000 solid 1px;">
   <tr>
     <td width="30%" bgcolor="#FFFFFF"><img src="img/logo.gif" width="214" height="65" /></td>
     <td width="70%" align="right" bgcolor="#FFFFFF"><img src="img/yg.jpg" width="409" height="55" style="margin-right:5px;" /></td>
   </tr>
</table>
<table width="100%" height="10" border="0" cellpadding="0" cellspacing="0">
   <tr>
     <td bgcolor="#C8B430"> </td>
   </tr>
</table>
	<table widt