fuagf -- yup -- all images are resized to fit in the frame side-to-side in a post being directly viewed (via its "...read_msg.aspx?message_id=xxxxxxxx" link) -- to see a large image in absolute full size, you can also click on the image in the post (or, my preference, rt-click and 'open in new tab/window' so the post remains open in its own tab), and then click on that image so opened one more time
images are also displayed in absolute full size by default when the given post is viewed as a reply (which, of course, is only possible with a post that is a reply to another post)