private void ShowIndex(int index)
{
imageindex = index;
// Labels
DateTime frametime = firstimagetime.AddMinutes(imageindex * 10);
timelabel.Text = frametime.Hour + ":" + frametime.Minute.ToString("00");
framelabel.Text = imageindex.ToString("00");
// Image
if(images != null)
radar.Image = images[imageindex];
radar.Update();
}