function showWeeksByID($weekID = 1, $numberOfWeeks = 1)
 {
     $xday = 1;
     for ($day = 1; $day < 358; $day++) {
         $tmp = parent::getWeekNum($day);
         if ($tmp == $weekID) {
             $xday = $day;
             break;
         }
     }
     if ($this->startOnSun) {
         $xday = $xday - 1;
     }
     $this->activeCalendarWeek($this->actyear, $this->actmonth, $xday, $this->GMT);
     return $this->showWeeks($numberOfWeeks);
 }