var wfslayer = new OpenLayers.Layer.WFS(
    "pg2s",
    WFS_SERVER_URL + "?format=WFS",
    { maxfeatures: 100, nocache: (new Date()).getTime() },
    { extractAttributes: true,
      displayInLayerSwitcher: false,
      styleMap: new OpenLayers.StyleMap({
        'default': {
          strokeColor: "black", strokeWidth: 1, fillColor: 'red',
          pointRadius: 5, fillOpacity: 1, strokeOpacity: 1
        },
      })
    }
  );