function Show(id,i_id){
        var on_img="images/plus2.gif";//打开时图片
        var off_img="images/plus.gif";//隐藏时图片
        var obj=document.getElementById('c_'+id);
        if(obj.style.display=="none"){
                obj.style.display="";
        i_id.src=on_img;
        //将子菜单Id放入Cookies
        var curShow = readCookie('curShow');
        if(curShow!='')
        {
          var arr_curShow = curShow.split(',');
          var found = false;
          for(i=0;i<arr_curShow.length-1;i++)
          {
            if(arr_curShow[i].toString()==id) {found=true;}
          }
          if(!found){writeCookie('curShow',curShow+','+id,12)}
        }
        else {
          writeCookie('curShow',id,12)
        }
        //将子菜单Id放入Cookies End
        }else{
                obj.style.display="none";
        i_id.src=off_img;
        //将子菜单Id从Cookies中移除
        var curShow = readCookie('curShow');
        if(curShow!='')
        {
          var arr_curShow = curShow.split(',');
          for(i=0;i<arr_curShow.length;i++)
          {
            if(arr_curShow[i].toString()==id) {arr_curShow=arr_curShow.del(i--);}
          }
          curShow = arr_curShow.join(',');
          //alert(curShow);
          writeCookie('curShow',curShow,12)
        }
        //将子菜单Id从Cookies中移除 End
        }

}

function readCookie(name)

{

  var cookieValue = "";

  var search = name + "=";

  if(document.cookie.length > 0)

  { 

    offset = document.cookie.indexOf(search);

    if (offset != -1)

    { 

      offset += search.length;

      end = document.cookie.indexOf(";", offset);

      if (end == -1) end = document.cookie.length;

      cookieValue = unescape(document.cookie.substring(offset, end))

    }

  }

  return cookieValue;

}

function writeCookie(name, value, hours)

{

  var expire = "";

  if(hours != null)

  {

    expire = new Date((new Date()).getTime() + hours * 3600000);

    expire = "; expires=" + expire.toGMTString();

  }

  document.cookie = name + "=" + escape(value) + expire;

}
Array.prototype.del=function(n) {  //n表示第几项，从0开始算起。
//prototype为对象原型，注意这里为对象增加自定义方法的方法。
  if(n<0)  //如果n<0，则不进行任何操作。
    return this;
  else
    return this.slice(0,n).concat(this.slice(n+1,this.length));
}


window.onload = function a()
{
  var curShow = readCookie('curShow');
  var totalShow = 3;  //自己修改一共有多少个二级分类
  if(curShow!=''&&curShow!=null)
  {
    for(i=1;i<=totalShow;i++)
    {
      document.getElementById('c_'+i).display="none";
    }
    var arr_curShow;
    arr_curShow = curShow.split(',');
    for(i=0;i<=arr_curShow.length-1;i++)
    {
      if(arr_curShow[i]!=''){document.getElementById('c_'+arr_curShow[i]).style.display="";}
    }

  }
}
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var obj = document.getElementById("cc");
obj.scrollTop=obj.scrollHeight*(Math.random());