upload your image onto a image hosting site, such as photobucket. This will give you an url. Then when you go to post a reply or new topic you click on the box that says image (above) put in your url then click on the box that says image again. That'll give you the
[.img] http://UrlOfPhotoGoesHere [./img].
TaDa. That's it.
Artificial intelligence is no match for natural stupidity.