Action Script 3.0 Check Mouse Direction

// This code is for action script 3.0
function Start()
{
    stage.addEventListener(MouseEvent.MOUSE_MOVE, CheckDirection);
}
Start();

var prevX = 0;
var prevY = 0;
var curX = 0;
var curY = 0;


var dirX:String = "";
var dirY:String = "";

function CheckDirection(e:MouseEvent)
{

    trace("X movement: " + GetHorizontalDirection() + ", Y movement: " + GetVerticalDirection());

    e.updateAfterEvent();
}

function GetHorizontalDirection():String
{
    prevX = curX;
    curX = stage.mouseX;

    if (prevX > curX)
    {
        dirX = "left";
    }
    else if (prevX < curX)
    {
        dirX = "right";
    }
    else
    {
        dirX = "none";
    }

    return dirX;
}

function GetVerticalDirection():String
{
    prevY = curY;
    curY = stage.mouseY;

    if (prevY > curY)
    {
        dirY = "up";
    }
    else if (prevY < curY)
    {
        dirY = "down";
    }
    else
    {
        dirY = "none";
    }

    return dirY;
}