Mark,
You can post your images in any size you want. The forum will automaticly reduce them for viewing. There will be a message on the top of the image that will say, "This image has been resized. Click this bar to view the full image. The original image is sized 1024x768." or what ever size you post it as. You can see it on my build log.
http://www.gt40s.com/forum/gt40-build-logs/13742-drb-5-a-5.html
Here is one from Photobucket
I transfer all of the pics I want to post to Photobucket in their full size. Once there, when I write my Reply, and I reach the point I want to insert the pic. I usually minimize the GT-40 web page, open a second browser window and go to Photobucket. I then find the pic I want to insert. By placing the mouse over the pic a window opens with all of the posting info available. You can get direct links to facebook, twitter etc.,
Email or IM link,
Direct Link,
HTML Code, and
ING code. I have no idea what the last two do. For posting to the Reply Box, use the Direct link box and left click on it, it will be highlighted, right click it and copy it. Reopen the GT40s Reply box, pllace the cursor where you want it, click on the mountain top box at the top of the reply window and insert the Direct Link and press enter. Your pic will be posted right in the spot you want, and reduced for display. Hit the
Preview Post button to see what it looks like. Make any adjustments you want , then
Submit Rely. Anyone that wants the original size will click on it and it will be displayed in its full size, which will probably take up the entire window. They can then save it or do what ever they wish.
Bill