--- a/map.js	Tue Mar 11 20:19:58 2014 +0200
+++ b/map.js	Tue Mar 11 20:48:17 2014 +0200
@@ -10,14 +10,20 @@
 var pmapTilePxPerRad = pmapTileSize / (2.0 * Math.PI);
 
 
-function pmapLatLngToMapCoord(latLng, zoom)
+function pmapMinMax(vval, vmin, vmax)
 {
-  msiny = Math.sin((latLng.lat() * Math.PI) / 180.0);
+  return Math.min(Math.max(vval, vmin), vmax);
+}
+
+
+function pmapLatLngToMapCoords(latLng)
+{
+  msiny = pmapMinMax(Math.sin((latLng.lat() * Math.PI) / 180.0), -0.9999, 0.9999);
 
   px = latLng.lng() * pmapTilePxPerDeg;
   py = 0.5 * Math.log((1 + msiny) / (1 - msiny)) * - pmapTilePxPerRad;
-  numTiles = 1 << zoom;
-  return new google.maps.Point(px * numTiles, py * numTiles);
+
+  return new google.maps.Point(Math.round((px * pmapTileOrig + 1) / 2), Math.round((py * pmapTileOrig + 1) / 2));
 }
 
 
@@ -31,6 +37,7 @@
 
 function pmapInitializeMap()
 {
+  // Initialize custom imagemap with our tiles
   var pmapBatMap = new google.maps.ImageMapType(
   {
     getTileUrl: function(coord, zoom)
@@ -38,13 +45,14 @@
       return "tiles/"+ zoom +"/"+ coord.y +"/"+ coord.x +".png";
     },
 
-    tileSize: new google.maps.Size(256, 256),
+    tileSize: new google.maps.Size(pmapTileSize, pmapTileSize),
     maxZoom: 10,
     minZoom: 3,
     radius: 1738000,
     name: 'BatMap'
   });
 
+  // Create map controller object
   pmap = new google.maps.Map(document.getElementById("map"),
   {
     zoom: 3,
@@ -78,9 +86,9 @@
 //
 function pmapCoordinateListener(point)
 {
-  var p = pmapLatLngToMapCoord(point.latLng, 7);
-  var tx = Math.round((p.x + 1) / 2);
-  var ty = Math.round((p.y + 1) / 2);
+  var p = pmapLatLngToMapCoords(point.latLng);
+  var tx = p.x;
+  var ty = p.y;
 
   var cx = tx;
   var cy = ty;