There may be a better way to do this but I would do it like this

private var lastMousePosition : Vector2;
private var mouseDelta : Vector2;

function Start () {
    lastMousePosition = Input.mousePosition;
}

function Update () {
    mouseDelta = Input.mousePosition - lastMousePosition;
    lastMousePosition = Input.mousePosition;

    // now mouseDelta represents the change in position since the last frame
    if (mouseDelta.x > 0) {
        ...
    }
    else if (mouseDelta.x < 0) {
        ...
    }
}

thanks for fast reply that dont seam to work also when i move right it says moving right but when i move the mouse to the left it dont seam to pick it up right away thanks for the help :)