Phil, we do allow attachments in posts, and allowed file types are txt, doc, pdf, jpg, gif, mpg and png, with a maximum size of 150KB per attachment allowed. To include a picture, type in your text and then click on the "Preview" button instead of the "Post" button. Then click on the "Browse" button to attach the picture. Up to 4 attachments are allowed per post by clicking on the "more attachments" string.
Ed