跪求：网页分成三部分如何得到HTML元素

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=GB18030">
<title>管理员操作界面</title>
<style type="text/css">
    body { background:#BED393; margin:0px; font:normal 12px 宋体; }
table { border:0px; }
td { font:normal 12px 宋体; }
img { vertical-align:bottom; border:0px; }
a { font:normal 12px 宋体; color:#215DC6; text-decoration:none; }
a:hover { color:#428EFF }
.sec_menu { border-left:1px solid white; border-right:1px solid white; border-bottom:1px solid white; background:#D6DFF7; padding:5px 2px;}
.menu_title { }
.menu_title span { position:relative; top:2px; left:8px; color:#215DC6; font-weight:bold; }
.menu_title2 { }
.menu_title2 span { position:relative; top:2px; left:8px; color:#428EFF; font-weight:bold; }
</style>
<script type="text/javascript" language="javascript">
function menuChange(obj,menu)
{
if(menu.style.display=="")
{
obj.background="images/admin_title_bg_show.gif";
menu.style.display="none";

}else{

obj.background="images/admin_title_bg_hide.gif";
menu.style.display="";
}
}function proLoadimg()
{
var i=new Image;
i.src='images/admin_title_bg_hide.gif';
}
proLoadimg();
</script>
</head>
<body>
  <form id="form1" runat="server">
    <table cellpadding="0" cellspacing="0" width="150px" align="center" bgcolor="#000000">
<tr style="CURSOR:hand">
<td height="25" class="menu_title" background="images/admin_title_bg_hide.gif"  onclick="menuChange(this,menu10);" bgcolor="#000000">
<span>系统菜单</span> 
</td>
</tr>
<tr>
<td>
<div class="sec_menu" style="WIDTH:150px" id="menu10">
<table cellpadding="0" cellspacing="0" align="center" width="135" bgcolor="#000000">
<tr height="70">
<td>
<table cellpadding="0" cellspacing="0" width="100%" align="center">
<tr height="60">
<td>
 <a href="login.jsp" target="_top"><b><font color="#999999">退出管理</font></b></a>   <a href="register.jsp" target="Main"><b><font color="#999999">注册用户</font></b></a>
</td>
</tr>
</table>
</td>
</tr>
</table>
</div>
</td>
</tr>
</table>

<div align="center" runat="server" id="setwork">
<table cellpadding="0" cellspacing="0" width="150" align="center" bgcolor="#000000">
<tr style="CURSOR:hand">
<td align="left" class="menu_title" background="images/admin_title_bg_hide.gif"  onclick="menuChange(this,menu3);" style="height: 25px">
<span>查询在线主机</span></td>
</tr>
<tr>
<td>
    <div class="sec_menu" style="WIDTH:150px" id="menu3">
<table cellpadding="0" cellspacing="0" align="center" width="135" height="60" bgcolor="#000000">
<tr height="20">
<td> <a href="servlet/SMSTypeServlet?type=2&op=gettypename" target="mainFrame"><font color="#999999">添加在线主机</font></a></td>
</tr>
<tr height="20">
<td> <a href="servlet/SMSTypeServlet?type=2&op=browse" target="mainFrame"><font color="#999999">查看在线主机</font></a></td>
</tr>
<tr height="20">
<td> <a href="indexdb.jsp" target="mainFrame"><font color="#999999">查询在线主机</font></a></td>
</tr>

</table>
</div></td>
</tr>
</table>
</div>

<div align="center" runat="server" id="admin_role">
<table cellpadding="0" cellspacing="0" width="150" align="center" bgcolor="#000000">
<tr style="CURSOR:hand">
<td align="left" height="25" class="menu_title" background="images/admin_title_bg_hide.gif"  onclick="menuChange(this,menu4);">
<span>用户管理</span>
</td>
</tr>
<tr>
<td>
<div class="sec_menu" style="WIDTH:150px" id="menu4">
<table cellpadding="0" cellspacing="0" align="center" width="135" height="60" bgcolor="#000000">


<tr height="20">
<td> <a href="servlet/SMSContentServlet?op=browse" target="mainFrame"><font color="#999999">查询指令</font></a></td>
</tr>
</table>
</div>
</td>
</tr>
</table>
</div>


<table cellpadding="0" cellspacing="0" width="150" align="center" id="TABLE1" bgcolor="#000000">
<tr style="CURSOR:hand">
<td align="left" height="25" class="menu_title" background="images/admin_title_bg_hide.gif"
onclick="menuChange(this,menu6);">
<span>版权信息</span>
</td>
</tr>
<tr>
<td>
<div class="sec_menu" style="WIDTH:150px" id="menu6">
<table cellpadding="0" cellspacing="0" align="center" width="135" height="60">
<tr height="20">
<td style="height: 20px" bgcolor="#000000"> <font color="#999999">版权所有：WZ</font></td>
</tr>
</table>
</div>
</td>
</tr>
</table>
    </form>
</body></html>
框架类的？document.frames['left']
理清了一下，网页代码是这样的
<HTML><HEAD><TITLE>My JSP 'index.jsp' starting page</TITLE>
<META http-equiv=Content-Type content="text/html; charset=gb2312">
<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">
<META content="MSHTML 6.00.2900.5726" name=GENERATOR></HEAD><FRAMESET border=0
frameSpacing=0 rows=80,* frameBorder=no cols=*><FRAME id=topFrame title=topFrame
name=topFrame src="My JSP 'index_jsp' starting page.files/top.htm" noResize
scrolling=no><FRAMESET border=0 frameSpacing=0 rows=* frameBorder=no
cols=180,*><FRAME id=leftFrame title=leftFrame name=leftFrame
src="My JSP 'index_jsp' starting page.files/left.htm" noResize
scrolling=yes><FRAME id=mainFrame title=mainFrame name=mainFrame
src="My JSP 'index_jsp' starting page.files/right.htm"></FRAMESET></FRAMESET></HTML>我要取的是FRAME id=leftFrame中的元素，应该怎么取？有没有人帮帮忙！

调试易

跪求：网页分成三部分如何得到HTML元素

解决方案 »