Instance auto shutdown when host shuts down or reboots

Hi community,
i've got a goal to set our db to autostart when linux starts, and autoshut when linux shuts down.
So i decided to use "su command" option, creating a script:

/etc/init.d/dbora

#! /bin/sh

# chkconfig: 2345 99 99

# description: Oracle auto start-stop script.

#

# Set ORACLE_HOME to be equivalent to the $ORACLE_HOME

# from which you wish to execute dbstart and dbshut;

#

# Set ORA_OWNER to the user id of the owner of the

# Oracle database in ORACLE_HOME.

ORA_HOME=/u01/app/oracle/product/11.2.0/dbhome_1

ORA_OWNER=oracle

case "$1" in

'start')

    # Start the Oracle databases:

    # The following command assumes that the oracle login