jQuery LigerUI toggleCol方法的使用 求大神指导

toggleCol: function (columnparm, visible) {

                 grid.columnparm.display["用户编码"].visible = false;

         }, 这是我写的代码 ，我刚学这个不懂，求各位大神指导啊。

隐藏，显示列？你看下官方demo，http://www.ligerui.com/

     <title></title>
    <link href="../../../lib/ligerUI/skins/Aqua/css/ligerui-all.css" rel="stylesheet" type="text/css">
    <script src="../../../lib/jquery/jquery-1.3.2.min.js" type="text/javascript"></script>
    <script src="../../../lib/ligerUI/js/core/base.js" type="text/javascript"></script>
    <script src="../../../lib/ligerUI/js/plugins/ligerGrid.js" type="text/javascript"></script> 
        <script src="../../../lib/ligerUI/js/plugins/ligerResizable.js" type="text/javascript"></script>
    <script src="../CustomersData.js" type="text/javascript"></script>
    <script type="text/javascript">
        var g;
        $(function () {
            g = $("#maingrid4").ligerGrid({
                columns: [
                { display: '主键', name: 'CustomerID', align: 'left', width: 120 },
                { display: '公司名', name: 'CompanyName', minWidth: 60 },
       {
           display: '城市', name: 'City', id: 'City1', 
            totalSummary:
            {
                type: 'count'
            } 

       }, { display: '城市', name: 'City' },
                 { display: '联系名', name: 'ContactName', width: 50, align: 'left' }
                ], pageSize:10,
                data: CustomersData,  
                width: '100%',height:'100%',allowHideColumn:false
            });


            $("#pageloading").hide();
        });
        function f_hideCity()
        { 
            g.toggleCol('City1', false);
        }
        function f_showCity()
        {
            g.toggleCol('City1', true);
        }
    </script>



    <input type="button" onclick="f_hideCity()" value="隐藏列">
 <input type="button" onclick="f_showCity()" value="显示列">
    <div id="maingrid4" style="margin:0; padding:0"></div>



  <div style="display:none;">
  <!-- g data total ttt -->
</div>

http://www.ligerui.com/api/document/Grid/event.htm 很好的例子