var Top =20037508.34;
                var Bottom = -20037508.34;
                var Right = 20037508.34;
                var Left = -20037508.34;
 
                extent = new OpenLayers.Bounds(Left, Bottom, Right, Top);
 
                var options = {
                    projection: "EPSG:900913",
                    minResolution: "auto",                    
                    maxResolution: "auto",
                    maxExtent: new OpenLayers.Bounds(Left, Bottom, Right, Top),
                    restrictedExtent: new OpenLayers.Bounds(Left, Bottom, Right, Top),//.transform(new OpenLayers.Projection("EPSG:4326"), new OpenLayers.Projection("EPSG:900913")),
                    controls: [
                    new OpenLayers.Control.Attribution(),
                    new OpenLayers.Control.Navigation(),
                    new OpenLayers.Control.PanZoomBar(),
                    new OpenLayers.Control.LayerSwitcher()
 
                    ]
 
 
                };
 
                map = new OpenLayers.Map('divMap',options);//, options
                map.addControl(new OpenLayers.Control.LayerSwitcher());
 
                var apiKey = "ApH0iiSTo5x4noXsrRzSAuwUsj5cqcvx_pquBecrT3htmE7pJ7kMTs4mOWGwlVkI";
                var road = new OpenLayers.Layer.Bing({
                    name: "Road",
                    key: apiKey,
                    type: "Road"
                });
                var hybrid = new OpenLayers.Layer.Bing({
                    name: "Hybrid",
                    key: apiKey,
                    type: "AerialWithLabels"
                });
                var aerial = new OpenLayers.Layer.Bing({
                    name: "Aerial",
                    key: apiKey,
                    type: "Aerial"
                });
 
                layer = new OpenLayers.Layer.GML("GeoJSON", "geo.json", {
                    projection: new OpenLayers.Projection("EPSG:4326"),
                    format: OpenLayers.Format.GeoJSON
                });