If you are using the upload attachments way of posting, then no you can not. When uploading you can only upload one photo per post. The way you can add more than one photo to your post is by using HTML and having the photos on a site that allows direct linking. These sites include your own web domain (example: www.slipsandlace.com) or the web space that is offered by your internet (ISP) host. Typically free sites such as Geocities do not allow remote linking. I have posted some basic HTML coding at
http://s3.invisionfree.com/SlipHeaven/index.php?showtopic=184.