public function seek($position)
{
if (!is_null($this->_cacheData)) {
$position = (int) $position;
if ($position < 0 || $position > $this->count()) {
throw new Zend_Db_Table_Rowset_Exception("Illegal index {$position}");
}
$this->_pointer = $position;
return $this;
} else {
return parrent::seek($position);
}
}
