Option for loading utfgrid via jsonp

lib/OpenLayers/Layer/UTFGrid.js

@@ -82,6 +82,20 @@ OpenLayers.Layer.UTFGrid = OpenLayers.Class(OpenLayers.Layer.Grid, {
      */
     serverResolutions: null,
 
+    /**
+     * APIProperty: useJSONP
+     * Should we use a JSONP script approach instead of a standard AJAX call?
+     *
+     * Set to true for using utfgrids from another server. 
+     * Avoids same-domain policy restrictions. 
+     * Note that this only works if the server accepts 
+     * the callback GET parameter and dynamically 
+     * wraps the returned json in a function call.
+     * 
+     * {Boolean} Default is false
+     */
+    useJSONP: false,
+
     /**
      * Constructor: OpenLayers.Layer.UTFGrid
      *