user picture upload fails; tries again successfully but old pictures gone

[cnyos]

Hello,
  a user tried to upload some pictures to the site
http://www.cnyos.org/virtualshowtable as cnyos member into the gallery CNYOS 2007 Virtual Showtable Pictures
and states that the pictures didn't load. Tried again, and the one picture then did load and display, but afterwards all of the old pictures in that album would not display. I used an ftp program and looked into the folders where the image files should be and it looked like they were still there, but going to the web site showed only the last picture uploaded.
I uploaded the image files again that I had saved previously, but I had downloaded the site to a flash drive before and am wondering which specific files could be taken from the flash drive to replace what has disappeared or if there is a database 'pointer' file or such that if uploaded to the proper spot on the site will allow the old pictures to display again? Another option is to find the file on the flash drive which had all of the text that was previously included when each picture was uploaded so that I don't have to contact the members and ask them to type it all in again, and edit/input myself.

thanks,
charles