[MediaPlayerFan]

One more detail:  Using the above script will create a bookmark if there are no bookmarks.  To prevent that, add the following lines after xbmc.executebuiltin("ActivateWindow(VideoBookmarks)")

xbmc.executebuiltin("Action(Right)")
time.sleep(0.01)

if xbmc.getCondVisibility("String.StartsWith(ListItem.Label,Chapter)") | xbmc.getCondVisibility("String.StartsWith(ListItem.Label,Bookmark)"):
       xbmc.executebuiltin("Action(noop)")
else:  
       xbmc.executebuiltin("Action(close)")