请教一个关闭按钮执行的问题，很简单，会者举手之劳

我使用天地图，注册了一个marker，点击弹出自定义窗口，这个自定义窗口是html输出的，里面有一个关闭按钮，但我不明白为什么我执行不到关闭。

var map, zoom = 12, markerclick;
var customerWinInfo = null;
map = new TMap("mapDiv");

/<script>

    $(document).ready(function () {

        var map, zoom = 12, markerclick;

        var customerWinInfo = null;

        map = new TMap("mapDiv");



        $.ajax({

            url: "/Home/GetStations",

            type: "get",

            cache: false,

            success: function (result) {

                var json = eval("(" + result + ")");

                for (var i = 0; i < json.stations.length; i++) {

                    var lnglat = new TLngLat(parseFloat(json.stations[i].Longitude), parseFloat(json.stations[i].Latitude));

                    if (i == 0) {

                        map.centerAndZoom(lnglat, zoom);

                    }

                    var marker = new TMarker(lnglat);

                    marker.txt = json.stations[i].RecorderId;

                    //注册标注的点击事件 

                    (function () {

                        var m = marker;

                        markerclick = TEvent.addListener(m, "click", function (p) {

                            //alert("标注当前坐标：" + m.getLngLat().getLng() + "," + m.getLngLat().getLat() + " \nid : " + " \n自定义属性，随机数： " + m.txt);



                            var html = [];

                            html.push('<div style="background:#CCCC99;height:20px;color:#000;width:135px;">');

                            html.push('     <span style="width:100px;float:left;margin-left:2px;background:">自定义信息窗口</span><span  style="width:30px;float:right;margin-right:2px;" onclick="onClose();">关闭</span>');

                            html.push('</div>');

                            html.push('<div id="deliver-legend-ctrl" style="background:#fff;border:1px solid #C0C0C0;">');

                            html.push(' <table cellspacing="0" cellspadding="0" style="width:130px;border:1px solid #ff0000;">');

                            html.push('     <tr align="center" style="height:10px;">');

                            html.push('         <td></td>');

                            html.push('         <td><a herf="javascript:void(0);"></a></td>');

                            html.push('     </tr>');

                            html.push('     <tr align="center">');

                            html.push('         <td>经度:</td>');

                            html.push('         <td>' + m.getLngLat().getLng() + '</td>');

                            html.push('     </tr>');

                            html.push('     <tr align="center">');

                            html.push('         <td>纬度:</td>');

                            html.push('         <td>' + m.getLngLat().getLat() + '</td>');

                            html.push('     </tr>');

                            html.push('     <tr style="height:10px;">');

                            html.push('         <td></td>');

                            html.push('         <td><a herf="javascript:void(0);"></a></td>');

                            html.push('     </tr>');

                            html.push(' </table>');

                            html.push('</div>');

                            var config = {

                                offset: new TPixel(0, 0),

                                position: m.getLngLat()

                            };

                            customerWinInfo = new TLabel(config);

                            customerWinInfo.setTitle('');

                            customerWinInfo.setLabel(html.join(''));

                            customerWinInfo.getObject().style.zIndex = 10000;

                            map.addOverLay(customerWinInfo);

                            var obj = customerWinInfo.getObject();

                            var width = parseInt(obj.offsetWidth);

                            var height = parseInt(obj.offsetHeight);

                            var icon = this.getIcon();

                            var anchor_icon = icon.getAnchor();

                            var pixel = new TPixel(width / -2, height / -2 - anchor_icon[1]);

                            customerWinInfo.setOffset(pixel);

                            

                        });

                        

                    })();

                    //(function () {

                    //    var m = marker;

                    //    TEvent.addListener(m, "mouseout", function (p) {

                    //        map.removeOverLay(customerWinInfo);

                    //    });

                        

                    //})();

                    map.addOverLay(marker);

                }

            }



        });



        map.enableHandleMouseScroll();

        ////创建图片对象 

        //var icon = new TIcon("http://api.tianditu.com/img/map/markerA.png", new TSize(19, 27), { anchor: new TPixel(9, 27) });

        ////向地图上添加自定义标注 

        //var marker = new TMarker(new TLngLat(116.411794, 39.9068), { icon: icon });



    });



    



</script>

官方给出的关闭窗口的代码：map.removeOverLay(customerWinInfo);，只要执行这一句就可以了
如果我把代码写在onclick="function onClose(){map.removeOverLay(customerWinInfo); };
又会没有作用，这个程序段有一个闭包，所以我不知道把这个onClose()函数写到哪里可以正确执行map.removeOverLay(customerWinInfo);