OpenLayers.Layer.Marker = Class.create();
OpenLayers.Layer.Marker.prototype = 
  Object.extend( new OpenLayers.Layer(), {
    
    // markers: store internal marker list
    markers: [],
    
    initialize: function(name) {
        OpenLayers.Layer.prototype.initialize.apply(this, arguments);
    },
    
    // Implement this. It may not need to do anything usually.
    moveTo: function(bounds,zoomChanged) {
        if (zoomChanged) {
            this.div.innerHTML="";
            for(i=0; i < this.markers.length; i++) {
                this.drawMarker(this.markers[i]);
            }
        }
    },
    addMarker: function(marker) {
        this.markers.append(marker);
        if (this.map && this.map.getExtent()) {
            this.drawMarker(marker);
        }
    },
    drawMarker: function(marker) {
        var resolution = this.map.getResolution();
        var extent = this.map.getExtent();
        var pixel = new OpenLayers.Pixel(
                       1/resolution * (marker.lonlat.lon - extent.minlon),
                       1/resolution * (extent.maxlat - marker.lonlat.lat)
                       );
        var m = marker.generateMarker(pixel);
        this.div.appendChild(m);
    }
});