code: function(options) {
          var updatePxExtent = this.minPx &&
              options.restrictedExtent != this.restrictedExtent;
          OpenLayers.Util.extend(this, options);
          // force recalculation of minPx and maxPx
          updatePxExtent && this.moveTo(this.getCachedCenter(), this.zoom, {
              forceZoomChange: true
          });
      }
docs: APIMethod: setOptions
  Change the map options
  
  Parameters:
  options - {Object} Hashtable of options to tag to the map