layers.add(layerOSMMapnik);
layers.add(layerOSMTilesAtHome);
layers.add(layerOSMCycleMap);
HashMap<String, String> mapOptions = new HashMap<String, String>();
Bounds boundsExtend = new Bounds(new LonLat(-20037508.34, -20037508.34), new LonLat(
20037508.34, 20037508.34));
mapOptions.put("maxExtent", boundsExtend.getJSconstructor());
mapOptions.put("projection", "new OpenLayers.Projection('EPSG:900913')");
mapOptions.put("displayProjection", "new OpenLayers.Projection('EPSG:4326')");
mapOptions.put("units", "'meters'");
mapOptions.put("maxResolution", "156543");
mapOptions.put("numZoomLevels", "18");