[MattR]

When you post/reply, you will see a section called "additional options" below the reply button. Click on the button called "manage attachments". You will be able to attach up to 4-5 pictures (I don't recall). When you submit the reply, the pictures are automatically inserted as thumbnails... that enlarge with clicked.

Many people like to embed larger photos using Photobucket. Then, you just past the "IMG" link within your post. It can cause slow downloads though like you indicated.