Aye, just set up a server of sorts with an older box. Give it a static IP on your local LAN - lets say it is 192.168.1.100 and its host name is "zeus". Edit each workstation's hosts file accordingly and every workstation will be able to access it via
http://zeus/ it sounds like you want a script that is functional yet easy to setup and use - maybe checkout Zen Photo with the Zen Page plugin:
http://www.zenphoto.org/