func removeInstanceFromLB(lb *elb.LoadBalancerDescription, id string) {
index := -1
for i, instance := range lb.Instances {
if instance.InstanceId == id {
index = i
break
}
}
if index > -1 {
copy(lb.Instances[index:], lb.Instances[index+1:])
lb.Instances = lb.Instances[:len(lb.Instances)-1]
}
}
