jquery.flexigrid 使用

<table id="flex1" style="display:none"></table>
            <input id="hidden" type="hidden" name="hidden" value="null" />
            <script>
            $("#flex1").flexigrid
            (
            {
            url: '../ReleaseInfoServlet?hidden=manage',
            dataType: 'json',
            colModel : [
                {display: '信息编号', name : 'RINO', width : 50, sortable : true, align: 'center',hide: false},
                {display: '信息标题', name : 'RITITLE', width : 250, sortable : true, align: 'center'},
                {display: '信息类别', name : 'IC.ICNAME', width : 100, sortable : true, align: 'center'},
                {display: '信息热点', name : 'RIHOTPOINT', width : 60, sortable : true, align: 'center'},
            
                {display: '发布日期', name : 'RIDATE', width : 120, sortable : true, align: 'center'},
                {display: '发布作者', name : 'RIAUTHOR', width : 80, sortable : true, align: 'center'}
                ],
            buttons : [
                {name: '添加', bclass: 'add', onpress : button},
                {name: '删除', bclass: 'delete', onpress : button},
                {name: '修改', bclass: 'modify', onpress : button},
                {separator: true}
                ],
            searchitems : [
                {display: '信息编号', name : 'RINO', isdefault: true},
                {display: '信息标题', name : 'RITITLE'},
                {display: '信息类别', name : 'IC.ICNAME'},
                {display: '发布作者', name : 'RIAUTHOR'}
                ],
            sortname: "RINO",
            sortorder: "desc",
            usepager: true,
            title: '信息发布管理',
            useRp: true,
            rp: 20,
            showTableToggleBtn: true,
             780,
            height: 300
            }
            );

            function button(com,grid)
            {
                if (com=='删除')
                    {
                        ${"hidden"}.value="delete";
                        if($('.trSelected',grid).length==0){
                            alert("请选择要删除的数据");
                        }else{
                            if(confirm('是否删除这 ' + $('.trSelected',grid).length + ' 条记录吗?'))
                            {
                              var  id ="";
                             for(var i=0;i<$('.trSelected',grid).length;i++){
                                if(i==$('.trSelected',grid).length-1){
                                    id += "id="+$('.trSelected',grid).find("td:first").eq(i).text();
                                } else {
                                    id += "id="+$('.trSelected',grid).find("td:first").eq(i).text()+"&";
                                }
                              }
                              window.location.href="../ReleaseInfoServlet?hidden="+${"hidden"}.value+"&"+id;
                          }
                       }
                    }
                else if (com=='添加')
                    {
                        ${"hidden"}.value="add";
                        window.location.href="infoAdd.jsp?hidden="+${"hidden"}.value;
                    }
                else if (com=='修改')
                {
                    ${"hidden"}.value="modify";
                    if($(".trSelected").length==1){
                        window.location.href="infoAdd.jsp?hidden="+${"hidden"}.value+"&id="+$('.trSelected',grid).find("td").eq(0).text();
                    }else if($(".trSelected").length>1){
                        alert("请选择一个修改,不能同时修改多个");
                    }else if($(".trSelected").length==0){
                        alert("请选择一个您要修改的新闻信息")
                    }
                }
            }