code: function(lonlat) {
      
          var quadrant = "";
          var center = this.getCenterLonLat();
          
          quadrant += (lonlat.lat < center.lat) ? "b" : "t";
          quadrant += (lonlat.lon < center.lon) ? "l" : "r";
      
          return quadrant; 
      }
docs: APIMethod: determineQuadrant
  Returns the the quadrant ("br", "tr", "tl", "bl") in which the given
  <OpenLayers.LonLat> lies.
  
  Parameters:
  lonlat - {<OpenLayers.LonLat>}
  
  Returns:
  {String} The quadrant ("br" "tr" "tl" "bl") of the bounds in which the
  coordinate lies.