Given your level of familiarity with PHP, this might be hard to follow. But this script (PHP Photo Album):
http://www.dynamicdrive.com/dynamici...photoalbum.htm
is very close to what you want. It's images only though.
I've already adapted it to use Fancy Box in place of its native Lightbox:
http://www.reddotcuisine.com/gallery.html
Using Pretty Photo (which isn't a standard*) shouldn't be too much different. But the PHP code in PHP Phptp Album's getalbumpics.php file would have to be changed to include the additional extensions required for your other file types you want it to include. Fancy Box might be able to do what you want as well, I would have to check to be sure.
One thing you may or may not understand though is that this local network you are talking about must be PHP capable, and that it's contents cannot be shown to anyone without access to it.
If that's what you have and you're not expecting others without access to this network to be able to see the images, videos, etc., then it can probably be worked out. The page need not refresh itself, that's one of the advantages of the PHP Photo Album script.
*Pretty Photo is a very nice script, just not standard. I'm not sure if any script like that (Lightbox type) can be called standard. It has all sorts of social media tie ins that a local network probably cannot use though. But it can still be used without those if you like its other features. I've worked with it before on other projects.
Lokesh Dhakar's Lightbox is the original and still going strong with updates - perhaps that's the standard. But it cannot do what you want. It's images only. There are tons of others around. Several can probably do the sort of multimedia things you want Pretty Photo for.
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