public static void SkipForward(SkipSpeed speed)
        {
            switch (speed)
            {
            case SkipSpeed.Small:   CurrentFrame++; break;

            case SkipSpeed.Medium:  CurrentFrame += mediumIncrement; break;

            case SkipSpeed.Large:   CurrentFrame += largeIncrement; break;
            }
        }
        public static void SkipBack(SkipSpeed speed)
        {
            switch (speed)
            {
            case SkipSpeed.Small:   CurrentFrame--; break;

            case SkipSpeed.Medium:  CurrentFrame -= mediumIncrement; break;

            case SkipSpeed.Large:   CurrentFrame -= largeIncrement; break;
            }
        }