在3.htm里写<input onclick="vv()" type=button value="控制">
<script>
a=true
function vv()
{
if(a)
parent.frame2.cols="50,*"
else
parent.frame2.cols="500,*"
a=!a}
</script>
<script>
a=true
function vv()
{
if(a)
parent.frame2.cols="50,*"
else
parent.frame2.cols="500,*"
a=!a}
</script>
<frame src="left.htm" name="topFrame" scrolling="NO" >
<frame src="main.htm" name="mainFrame">
</frameset>left.htm
..main.htm<input type=button onclick="window.parent.baobao.cols='0,100%'" value="隐藏">
<input type=button onclick="window.parent.baobao.cols='92,*'" value="显示">