code: function(workingDate, cell) {
          Dom.addClass(cell, this.Style.CSS_CELL);
          Dom.addClass(cell, this.Style.CSS_CELL_RESTRICTED);
          cell.innerHTML=workingDate.getDate();
          return Calendar.STOP_RENDER;
      }
docs: Renders the current calendar cell as a non-selectable "black-out" date using the default
  restricted style.
  @method renderBodyCellRestricted
  @param {Date}     workingDate  The current working Date object being used to generate the calendar
  @param {HTMLTableCellElement} cell   The current working cell in the calendar
  @return {String} YAHOO.widget.Calendar.STOP_RENDER if rendering should stop with this style, null or nothing if rendering
  should not be terminated