请求高手帮忙改下小程序，万分感激
我想用div+css是实现这样一个效果，点击标题栏的减号时，变为最小化，其实就是隐藏内容，只剩下标题栏，点下方框后又显示隐藏的内容。
小弟的代码如下，不知道错在哪里请求高手们帮助
<style>
body   {
margin:0px;
padding:0px;
font-size:12px;
text-align:center;
background-image:   url(pic/bg01.jpg);
}
body   >   div   {text-align:center;   margin-right:auto;   margin-left:auto;}  
#content-top{margin-left:auto;   margin-right:auto;   width:1000px;   height:1px;}
#cmid{margin-left:auto;   margin-right:auto;   width:800px;   height:25px;}

.content{width:1000px;}
.content   .left{
                float:left;
                width:20%;
                /*border:1px   solid   #FF0000;*/
                margin:3px;
}
.content   .center{float:left;border:1px   solid   #ffffff;margin:3px;width:57%}
.content   .right{float:right;width:20%;border:1px   solid   #ffffff;margin:3px}
.content   .right2{float:right;width:20%;border:1px   solid   #ffffff;margin:3px}
.mo{height:auto;border:1px   solid   #CCC;margin:3px;background:#FFF}
.mo   h1{background:#ECF9FF;height:18px;padding:3px;cursor:move}
.closediv{cursor:default;}
.minusspan{cursor:default;}
.mo   .nr{height:80px;border:1px   solid   #F3F3F3;margin:2px}
h1{margin:0px;padding:0px;text-align:left;font-size:12px}
.dragging   {
                FILTER:   progid:DXImageTransform.Microsoft.Alpha(opacity=60);   opacity:   0.6;   moz-opacity:   0.6
}
</style>

<script   language=JScript>
<!--
//可以打包为js文件;

//关闭;
function   cls(obj)
{
var   win   =   obj.parentNode.parentNode;
var   sha   =   win.nextSibling;
//win.style.visibility   =   "hidden ";
sha.style.visibility   =   "hidden ";
sha.style.display   =   "none ";
}

function   op(obj)
{
var   win   =   obj.parentNode.parentNode;
var   sha   =   win.nextSibling;
//win.style.visibility   =   "hidden ";
sha.style.visibility   =   "visible ";
sha.style.display   = "block ";
}
//创建一个对象;
//-->
</script>
<div   class=content>
                <div   class=left   id=dom0>
                                <div   class=mo   id=m0>
                                                <h1   > m0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span   style= 'width:12;border-width:0px;color:red;font-family:webdings; '   onclick= 'op(this) '> c </span> &nbsp;&nbsp;&nbsp; <span   style= 'width:12;border-width:0px;color:red;font-family:webdings; '   onclick= 'cls(this) '> 0 </span> </h1>