code: function() {
          // set up properties for Mercator - assume EPSG:900913
          this.RESOLUTIONS = [];
          var maxResolution = 156543.03390625;
          for(var zoom=0; zoom<=this.MAX_ZOOM_LEVEL; ++zoom) {
              this.RESOLUTIONS[zoom] = maxResolution / Math.pow(2, zoom);
          }
          this.units = "m";
          this.projection = this.projection || "EPSG:900913";
      }
docs: Method: initMercatorParameters
  Set up the mercator parameters on the layer: resolutions,
  projection, units.