Using resolution instead of zoom level for initial center (see #418).

examples/bing-tiles.js

@@ -23,7 +23,9 @@ var hybrid = new OpenLayers.Layer.Bing({
 
 map.addLayers([road, aerial, hybrid]);
 map.addControl(new OpenLayers.Control.LayerSwitcher());
+// Zoom level numbering depends on metadata from Bing, which is not yet loaded.
+var zoom = map.getZoomForResolution(76.43702827453613);
 map.setCenter(new OpenLayers.LonLat(-71.147, 42.472).transform(
     new OpenLayers.Projection("EPSG:4326"),
     map.getProjectionObject()
-), 11);
+), zoom);