AS3 MouseEvent Wheel Question

[Palmei]

I have put a 3072 height Movie clip on the stage that I would like to scroll up and down on. Searching help I have came up with the code below:

import flash.events.MouseEvent;

function mouseWheel (event : MouseEvent):void {

          if ((event.delta < 0 && box_mc.y > 0 )||

                     (event.delta > 0 && box_mc.y < stage.stageHeight - box_mc.height)){

                              box_mc.y = box_mc.y + (event.delta * 2);

                    }

}

stage.addEventListener(MouseEvent.MOUSE_WHEEL,mouseWheel);

I will scroll down but not up. I was seeing about reversing this function but am lost on how to do so. How would I got about reversing this function so that I may mouse wheel up and mouse wheel down?

Where would I look in help to find if I was to scroll and have it ease into the mouse wheel event rather than just slowing moving without ease?

Thank you in advanced for any help and advice.

[moccamaximum]

import flash.events.MouseEvent;

stage.addEventListener(MouseEvent.MOUSE_WHEEL, mouseWheel);

function mouseWheel(event:MouseEvent):void

{

    if (box_mc.y >= 0 && box_mc.y <= stage.stageHeight)

    {

        box_mc.y -=  event.delta;

    }

    else

    {

        if (box_mc.y < 0)

        {

            box_mc.y = 0;

        }

        else if (box_mc.y > stage.stageHeight)

        {

            box_mc.y = stage.stageHeight;

        }

    }

}