EDIT

            if(opts.showLayerSwitcher === true){

                defaultControls.push(new OpenLayers.Control.LayerSwitcher({'ascending':false}));

            }

            // defaultControls.unshift(layerLoadingControl()); // as first control, needs to be below all others!

            var maxResolution = null;

            // gmaps has no maxExtent at this point, need to check for null

            if(defaultBaseLayer.maxExtent != null){

                maxResolution = Math[(opts.displayOutsideMaxExtent ? 'max' : 'min')](

                        defaultBaseLayer.maxExtent.getWidth() / getWidth(),

                        defaultBaseLayer.maxExtent.getHeight() / getHeight()

                );

            }

            console.log("mapOptions.maxResolution: " + maxResolution);

            console.log("mapOptions.restrictedExtent: " + defaultBaseLayer.maxExtent);

            map = new OpenLayers.Map(

                    "openlayers_map",

                    {

                        // defines the map ui elements and interaction features

                        controls: defaultControls,

                        // maxResolution determines the lowest zoom level and thus places the map

                        // in its maximum extent into the available view port so that no additinal

                        // gutter is visible and no parts of the map are hidden

                        // see http://trac.osgeo.org/openlayers/wiki/SettingZoomLevels

                        // IMPORTANT!!!

                        // the maxResulution set here will be overwritten if the baselayers maxResolution

                        // it is set

                        maxResolution: maxResolution,

                        // setting restrictedExtent the the maxExtent prevents from panning the

                        // map out of its bounds

                        restrictedExtent: defaultBaseLayer.maxExtent,

                        // Setting the map.fractionalZoom property to true allows zooming to an arbitrary level

                        // (between the min and max resolutions).

                        // fractional tiles are not supported by XYZ layers like OSM so this option would

                        // break the tile retrieval for OSM (e.g.: tile for fractional zoom level

                        // 1.2933333333333332 = http://b.tile.openstreetmap.org/1.2933333333333332/1/0.png)

                        fractionalZoom: defaultBaseLayer.CLASS_NAME != "OpenLayers.Layer.OSM" && defaultBaseLayer.CLASS_NAME != "OpenLayers.Layer.XYZ",

                        eventListeners: opts.eventListeners,

                        // creating the map with a null theme, since we include the stylesheet directly in the page

                        theme: null

                    }

            );

            //add the base layers

            addLayers(baseLayers);

            map.setBaseLayer(defaultBaseLayer);

            // calculate the bounds to zoom to

            zoomToBounds = zoomToBoundsFor(opts.boundingBox ? opts.boundingBox : defaultBaseLayerBoundingBox, defaultBaseLayer);

            zoomToBounds = cropBoundsToAspectRatio(zoomToBounds, map.getSize().w / map.getSize().h);

            console.log("baselayer zoomToBounds: " + zoomToBounds);