In the petroliana forums, including For Sale, you can do a Direct Upload by Attachment. See this post for instructions:
http://www.oldgas.com/forum/ubbthreads.php?ubb=showflat&Number=129148

In the Non-Petro forums, including Non-Petro For Sale, the Direct Upload is not enabled because of the cost issue on the server. You can post images hosted on a service like ImageShack. See this post for instructions:
http://www.oldgas.com/forum/ubbthreads.php?ubb=showflat&Number=126797

ImageShack or PhotoBucket hosted images may be used on any forum except for the Image Gallery forums.

You can resize images to the recommended 640 pixel size by going to:
http://www.shrinkpictures.com/

Try out posting images on our Testing Area forum.

Jim "Oldgas" Potts
Your host and moderator