var numZoomLevels = Math.max(mapnik.numZoomLevels, osmarender.numZoomLevels);
markers = new OpenLayers.Layer.Markers("Markers", {
var numZoomLevels = Math.max(mapnik.numZoomLevels, osmarender.numZoomLevels);
markers = new OpenLayers.Layer.Markers("Markers", {