FRAME框架和隐藏或者展开目录树综合应用问题 ？？？？？？？
目前急需解决一个框架问题

我要实现的是两个框架嵌套中实现隐藏树型菜单的功能，在一个框架中实现是正常的，框架嵌套过程出现问题。。。。。。。

1、最外层框架如下:

<FRAMESET border=0 frameSpacing=0 rows=58,* TOPMARGIN= "0 " LEFTMARGIN= "0 " MARGINHEIGHT= "0 " MARGINWIDTH= "0 " frameborder= "0 " borderColor= "#A1C7F9 ">

<FRAME border=0 name=fraToolbar marginWidth=0 marginHeight=0 src= "top.jsp " frameBorder=no noresize scrolling=no TOPMARGIN= "0 " LEFTMARGIN= "0 ">
<FRAME border=0 name= "FrameContent " marginWidth=0 marginHeight=0 src= "mid.jsp " frameBorder=no noresize scrolling=no TOPMARGIN= "0 " LEFTMARGIN= "0 ">

</FRAMESET>

mid.jsp内容调用一个包含文件如下：

<%@include file= "tabbar.jsp "%>

tabbar.jsp是调用一个xml文件；

2、调用的内层框架mid.jsp内容如下：

<FRAMESET name= "FrameContent " border= "0 " frameSpacing= "0 " borderColor= "#A1C7F9 " frameBorder= "0 " cols= "10,200,10,* ">
<FRAME border= "0 " name= "menus_swhidden " src= "line.jsp " noResize scrolling= "no " target= "_self ">
<FRAME name= "left1 " src= "left/left_menu.jsp " target= "_self ">
<FRAME border= "0 " name= "menus_swhidden " src= "menu_hidden.jsp " noResize scrolling= "no " target= "_self ">
<FRAME name= "rightframe " src= "module/default.jsp " frameBorder= "no " topmargin= "0 " leftmargin= "0 ">
</FRAMESET>


3、在menu_hidden.jsp实现隐藏或展示树型菜单，出现问题：top.FrameContent.cols为空或者不是对象，menu_hidden.jsp内容：

<script language= "javascript ">
function ShowHideTree(){
alert( "wwwwww "+top.FrameContent.cols);
if (top.FrameContent.cols!= "0,0,10,* "){
alert( "ssssssss ");
top.FrameContent.cols= "0,0,10,* ";
icon_arrow.src= "images/open_left.gif ";
}else{
alert( "wwwwww ");
top.FrameContent.cols= "10,200,10,* ";
icon_arrow.src= "images/close_left.gif ";
}
}
</script>

<table height= "100% " cellspacing= "0 " cellpadding= "0 " width= "10 " background= "images/2.jpg " border= "0 ">
<tbody> <tr> <td align=middle>
<img id= "icon_arrow " title= "隐藏或者展开目录树 " style= "cursor: hand " onclick= "ShowHideTree(); " height= "138 " src= "images/close_left.gif " width= "10 ">
</td> </tr> </tbody>
</table>

怎么实现隐藏或者展开目录树？？？？？？？？？？？

[解决办法]
注意：top是最顶级的，parent是上一级的
------解决方案--------------------

在menu_hidden.jsp中的fuction改为如下：
function ShowHideTree(){
if (parent.FrameContent.cols!= "0,0,10,* "){
parent.FrameContent.cols= "0,0,10,* ";
icon_arrow.src= "images/open_left.gif ";
}else{
parent.FrameContent.cols= "10,200,10,* ";
icon_arrow.src= "images/close_left.gif ";
}
}