在框架页面上想使某个页面在整个窗口显示

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
</head><frameset rows="80,*,80" frameborder="no" border="0" framespacing="0">
  <frame src="1.htm" name="topFrame" scrolling="No" noresize="noresize" id="topFrame" />
  <frame src="2.htm" name="mainFrame" id="mainFrame" />
  <frame src="3.htm" name="bottomFrame" scrolling="No" noresize="noresize" id="bottomFrame" />
</frameset>
<noframes><body>
</body>
</noframes></html>
-----2.htm------------
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
<script>
function hidAll()
{
var the = parent.window.frames ;
for( var i = 0 ; i < the.length ; i++ )
{
if( the[ i ].name != "mainFrame" )
{
the[ i ].frameElement.style.display = "none" ;
}
}
}
</script>
</head><body>
<div onclick="hidAll()">test</div>
</body>
</noframes></html>