float ScrollingSpeed = 1;
float mouseWheelPosition = 0.0;
float sensitivity = 0.005;
float minFov = -10 ;
float maxFov = 10 ;
float initialFov = 0;
Vector3 SpriteLocationInit;
Vector3 SpriteLocation;
float LoopDuration ;
void Main()
{
    if (iInitializing())
    {
       iObjectLocation(OBJ_3,SpriteLocationInit);
       SpriteLocation = SpriteLocationInit;
       mouseWheelPosition = iMouseZ(false);
}
     else
    {
       iObjectLocationSet(OBJ_3,SpriteLocation);
       SpriteLocation.y -= ScrollingSpeed;
       if (SpriteLocation.y < -LoopDuration) SpriteLocation.y = SpriteLocationInit.y;
    }

    float fov = initialFov + (mouseWheelPosition - iMouseZ(false)) * sensitivity;
    if (fov < minFov)
    {
       fov = minFov;
       mouseWheelPosition = (minFov - initialFov)/sensitivity + iMouseZ(false);
    }
    if (fov > maxFov)
    {
       fov = maxFov;
       mouseWheelPosition = (maxFov - initialFov)/sensitivity + iMouseZ(false);
    }
    SpriteLocation.y -= ScrollingSpeed;
    SpriteLocation.y = SpriteLocationInit.y;
    SpriteLocationInit.y = fov;
}