Hi,
I'm a professional web developper working with PHP more than 10 years. I'm also a network admin in a insurance business, in Canada and i have the same setup. I had developped a "reception screen" in order to show our insurance program (JPG) which are in a network share. I also add the company logo, date and time, and meteo with a news feed...
So, it will be easy to do it for you. Is your network share already mounted on your win 7 at the reception? The best way to do this project is to mount the network share in the public_html (or www) so the script will access easily to all JPGs...
Regards,