code: function(sDates, fnRender) {
          var aDates = this._parseDates(sDates);
          for (var i=0;i<aDates.length;++i) {
              var aDate = aDates[i];
          
              if (aDate.length == 2) { // this is either a range or a month/day combo
                  if (aDate[0] instanceof Array) { // this is a range
                      this._addRenderer(Calendar.RANGE,aDate,fnRender);
                  } else { // this is a month/day combo
                      this._addRenderer(Calendar.MONTH_DAY,aDate,fnRender);
                  }
              } else if (aDate.length == 3) {
                  this._addRenderer(Calendar.DATE,aDate,fnRender);
              }
          }
      }
docs: Adds a renderer to the render stack. The function reference passed to this method will be executed
  when a date cell matches the conditions specified in the date string for this renderer.
  @method addRenderer
  @param {String} sDates  A date string to associate with the specified renderer. Valid formats
  include date (12/24/2005), month/day (12/24), and range (12/1/2004-1/1/2005)
  @param {Function} fnRender The function executed to render cells that match the render rules for this renderer.