the essence of this.
on a long landing in the middle of a very large width of the picture(exact size not known), I would like to when dorroliver to her, she began to scroll sideways. once you reach the right edge of the picture continues to scroll down as always(respectively if up scalise the picture goes to the right).
tried using -
position: fixed; unit worked only the first part(when scroles down to the picture).
compare offsetTop his unit and prostrelennoe distance.
but then to leave it and continue to scroll up not out.