your pics are too big, try saving them to a folder on your computer. open them indivdually, then right click on them and look for a way to resize them, then just save them at 800x600 into a seperate folder or with a different name. then post the 800x600 pics.
or you should actually be able to just upload them with the button 'Manage Attachments' a little lower down on this page (the page that comes up when your posting a message). when upload from there, we should see thumbnails of all the pics which we can click on individually to enlarge.
hope this helps

bozo,
peace, love, dope