it said: "Form validation error Only .GIF, .JPG, .PNG or .TXT files can be uploaded" when I tried to post a jp2 file that displays o.k. in my browser. but when I relabelled it as jpg .... it included the upload into the source code, but it said: "The image http://www.renderosity.com/photos/MSG2/Message2527558.jpg cannot be displayed, because it contains errors."