Banking and momentum

Hi. I recently got a script for an aeroplane, and I need to know how to make it bank.

var maxTorque : float = 10.0f;
var forwardForce : float = 10.0f;

var currentTorqueHor : float = 0.0f;
var currentTorqueVer : float = 0.0f;

function Update()
{
    currentTorqueHor = maxTorque * Input.GetAxis("Horizontal"); 
    currentTorqueVer = maxTorque * Input.GetAxis("Vertical");
    }

function FixedUpdate()
{   
    rigidbody.AddForce(transform.forward * forwardForce);
    rigidbody.AddRelativeTorque(currentTorqueVer, 0.0f, -currentTorqueHor);
}

This script doesn't let me bank. When I rotate a bit I have to go up to move in that direction. I've seen people do it before and it works very well. Also, I have a problem with momentum. When I change direction, it takes a while for my momentum to recede. So, if I turn the opposite direction, I will fly in backwards while slowing down until it stops, and then accelerate forward. Anyone know how to change this?

//replace with this script.
//under edit-projectsettings-inputs set the axis you want
// to use to bank and call it "Bank" .
var maxTorque : float = 10.0f;
var forwardForce : float = 10.0f;

var currentTorqueHor : float = 0.0f;
var currentTorqueVer : float = 0.0f;
var currentTorqueBank : float = 0.0f;

function Update()
{
    currentTorqueHor = maxTorque * Input.GetAxis("Horizontal"); 
    currentTorqueVer = maxTorque * Input.GetAxis("Vertical");
    currentTorqueBank = maxTorque * Input.GetAxis("Bank");
    }

function FixedUpdate()
{   
    rigidbody.AddForce(transform.forward * forwardForce);
    rigidbody.AddRelativeTorque(currentTorqueVer,currentTorqueBank, -currentTorqueHor);
}