script to automatically attach and detach an EC2::Instance from elbs

definition

Our architecture uses an Ec2:Instance to define a master, 
such instance doesn't have the automatic management of elb attachment 
provided by the AWS::AutoScaling::AutoScalingGroup to slaves so 
this script roughly replicates it by attaching an instance 
upon boot and releasing it during shutdown.  

elb-controller

#!/bin/bash
# chkconfig: 12345 99 01
#     /etc/init.d/elb-controller
# description: Registra esta instância nos ELBs.
. /etc/init.d/functions

STORES=`cat /etc/available-elbs`
AWS_REGION=`cat /etc/aws-region`

export JAVA_HOME=/usr/lib/jvm/jre-1.6.0
export AWS_ELB_HOME=/opt/aws/apitools/elb

function start () {
for STORE in $STORES
do
    /opt/aws/bin/elb-register-instances-with-lb $STORE --instances `wget -q -O - http://169.254.169.254/latest/meta-data/instance-id` --access-key-id XXX  --secret-key YYY --region $AWS_REGION
done
touch /var/lock/subsys/elb-controller
}
function stop () {
for STORE in $STORES
do
    /opt/aws/bin/elb-deregister-instances-from-lb $STORE -instances `wget -q -O - http://169.254.169.254/latest/meta-data/instance-id` --access-key-id XXX --secret-key YYY --region $AWS_REGION
done
rm /var/lock/subsys/elb-controller
}
case "$1" in
        start)
                start
                ;;
        stop)
                stop
                ;;
        restart)
                stop
                sleep 2
                start
                ;;
        *)
                echo "Uso: $0 {start|stop|restart}"
esac

usage

       chmod 755 /etc/init.d/elb-controller
       chkconfig --add elb-controller
       chkconfig elb-controller --level 12345 on
       chkconfig elb-controller --level 06 off
       echo "$AWS_REGION" >> /etc/aws-region
       echo "$ELBS" >> /etc/available-elbs

can you please post something similar for Windows instances as well?