It appears they don't want you linking directly to the images. Best to go with the OP's link.
The 2nd URL works. Websites can try (Flickr) but they can't stop the simpleness of HTML and sharing a URL.
TrekBBS' policy to not insert an image from a server which I do not have an account is valid but I'm going to make it as easy as I can for others to see an image that is relevant to the discussion with a URL to the JPEG when possible.