网页内调整框架大小

框架网页, 左侧导航, 现想在其分割线处,做一按钮, 按一下, 右侧窗口调至满屏, 再按则恢复.
没什么思路, 求高手赐教.
不用框架也行,实现相同效果就可以了.
---------------------------------------------------------------

主页面:

1<frameset border="0" bordercolor="#0086ef" cols="180,*" frameborder="0" id="Frm" name="Frm">
2<frame id="LeftFrm" name="LeftFrm" scrolling="auto" src="left.htm" target="RightFrm" width="100%"/>
3<frameset border="0" cols="10,*" frameborder="0" id="MiddleFrm" name="MiddleFrm">
4<frame id="ButtonFrm" name="ButtonFrm" noresize="" scrolling="no" src="middle.htm"/>
5<frame id="RightFrm" name="RightFrm" scrolling="auto" src="right.htm" width="100%"/>
6</frameset>
7</frameset>

middle.htm

 1<html>
 2<head>
 3<title></title>
 4<meta content="Microsoft Visual Studio 6.0" name="GENERATOR"/>
 5<script language="JavaScript">   
 6function HiddenBar()   
 7{   
 8if (switchPoint.innerText==3)   
 9{   
10switchPoint.innerText=4   
11  
12top.Frm.cols="0,*"   
13}   
14else   
15{   
16switchPoint.innerText=3   
17  
18top.Frm.cols="180,*"   
19}   
20}   
21</script>
22<style>   
23.navPoint { COLOR: #000000; CURSOR: hand; FONT-FAMILY: Webdings; FONT-SIZE: 9pt }   
24P { FONT-SIZE: 9pt }   
25.smallFont { FONT-FAMILY: "宋体"; FONT-SIZE: 10.5pt; TEXT-DECORATION: none }   
26</style>
27</head>
28<body bgcolor="0065EF" leftmargin="0" topmargin="0">
29<table align="left" border="0" cellpadding="0" cellspacing="0" height="100%" id="Table1" width="100%">
30<tr>
31<td align="right" onclick="javascript:HiddenBar()"><span class="navPoint" id="switchPoint" title="关闭/打开左栏">3</span></td>
32</tr>
33</table>
34</body>
35</html>

---------------------------------------------------------------

主页面:

1<frameset border="0" bordercolor="#0086ef" cols="180,*" frameborder="0" id="Frm" name="Frm">
2<frame id="LeftFrm" name="LeftFrm" scrolling="auto" src="left.htm" target="RightFrm" width="100%"/>
3<frameset border="0" cols="10,*" frameborder="0" id="MiddleFrm" name="MiddleFrm">
4<frame id="ButtonFrm" name="ButtonFrm" noresize="" scrolling="no" src="middle.htm"/>
5<frame id="RightFrm" name="RightFrm" scrolling="auto" src="right.htm" width="100%"/>
6</frameset>
7</frameset>

middle.htm

 1<html>
 2<head>
 3<title></title>
 4<meta content="Microsoft Visual Studio 6.0" name="GENERATOR"/>
 5<script language="JavaScript">   
 6function HiddenBar()   
 7{   
 8if (switchPoint.innerText==3)   
 9{   
10switchPoint.innerText=4   
11  
12top.Frm.cols="0,*"   
13}   
14else   
15{   
16switchPoint.innerText=3   
17  
18top.Frm.cols="180,*"   
19}   
20}   
21</script>
22<style>   
23.navPoint { COLOR: #000000; CURSOR: hand; FONT-FAMILY: Webdings; FONT-SIZE: 9pt }   
24P { FONT-SIZE: 9pt }   
25.smallFont { FONT-FAMILY: "宋体"; FONT-SIZE: 10.5pt; TEXT-DECORATION: none }   
26</style>
27</head>
28<body bgcolor="0065EF" leftmargin="0" topmargin="0">
29<table align="left" border="0" cellpadding="0" cellspacing="0" height="100%" id="Table1" width="100%">
30<tr>
31<td align="right" onclick="javascript:HiddenBar()"><span class="navPoint" id="switchPoint" title="关闭/打开左栏">3</span></td>
32</tr>
33</table>
34</body>
35</html>
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