public function rollback($throw=true)
	{
		if (!$this->transactionOpen && $throw) $this->throwError("Transaction not open  to rollback()","");
		if (!$this->isOpen) { $this->throwError("It's not connected to the database",""); return false; }
		$this->transactionOpen = false;
		return @$this->conn1->rollback();
	}