openlayer 添加marker弹出窗口

var markers,marker,popup;var markArr=new Array();function addMarker(){/* var url = 'http://www.openlayers.org/dev/img/marker.png';                var sz = new OpenLayers.Size(20, 20);  //尺寸大小                var calculateOffset = function(size) {                                    return new OpenLayers.Pixel(-(size.w/2), -size.h);                                 };                var icon = new OpenLayers.Icon(url, sz, null, calculateOffset);marker = new OpenLayers.Marker(new OpenLayers.LonLat(116.34851,33.22630), icon);*/if(popup!=null){ onPopupMouseDown(); //先移除掉 } feature = new OpenLayers.Feature(tiled, new OpenLayers.LonLat(116.34851,33.22630));//tiled 是增加的图层名称，OpenLayers.Layer.WMS的对象 marker = feature.createMarker();  markers.addMarker(marker);marker.events.register("mousedown", marker, function(evt){ if (popup == null) {popup = new OpenLayers.Popup("click",  new OpenLayers.LonLat(116.34851,33.22630), new OpenLayers.Size(100,100), "click me", true); popup.setBorder("#999999 solid 1px"); popup.closeOnMove = true;map.addPopup(popup);} else {popup.toggle(); }OpenLayers.Event.stop(evt);});}//移除Popupfunction onPopupMouseDown() {            markers.map.removePopup(popup);            popup.destroy();            popup = null;        }  

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