困惑的很久的openlayers 动态标注提示信息问题，现已解决。其实很简单

1. 创建图层layer
function enableMarkerLayer() 

   {//创建图层
    markers = new OpenLayers.Layer.Markers("图层名称");
    map.addLayer(markers);
    markers.setZIndex(200);
}

2. 创建marker对象
传入对象 经度、纬度、图片宽度、图片高度、标注图片
var marker = GetMark(ll.lon, ll.lat, w, h, stateImg);

function GetMark(lon, lat, w, h, statusImg){
  var size = new OpenLayers.Size(w, h);
  var offset = new OpenLayers.Pixel(-(size.w/2), -size.h);
  var icon = new OpenLayers.Icon(statusImg, size, offset);
  return new OpenLayers.Marker(new OpenLayers.LonLat(lon,lat),icon)
}

3. 添加marker到图层中，注册openlayers事件机制
 markers.addMarker(marker);
 marker.events.register("mousedown", marker, markerClickMouseDown);
var markerClickMouseDown = function(evt){
       removeAllPopup();
       OpenLayers.Event.stop(evt);    
       popup = new OpenLayers.Popup(""+ll.lon + ""+ ll.lat,
                   ll,
                   new OpenLayers.Size(200,200),
                   html,
                   false);
            popup.setBackgroundColor("black");
           // popup.setOpacity(0.1);
            //popup.autoSize=true;
            map.addPopup(popup);
  };
  删除方法如下：
function removeAllPopup(){//移除标记信息

    var len =map.popups.length;   
    for(var i=len-1;i>=0;i--){
      map.removePopup(map.popups[i]);        
    }
}

3. 最后在click后，销毁标注
if(popup){
     removeAllPopup();
     OpenLayers.Event.stop(evt);
     return !this.stopSingle;
}

到这一步相信大家都会大功告成，谢谢。欢迎指点，共同讨论！