hey there. got this site goin pretty well and i'm using floatbox. I looks great, does everything I want.
BUT...
I'm trying to figure out if there's a way I can add a transparent .png on top of the photos while using FloatBox.
My goal is to place a "watermark" over them all without having to edit them everytime i get new ones.

I think the only way to do that would be to setup each image on its own little html page with the overlay the way you want it. Then load those pages as the items in your floatbox gallery. They will come in as iframes, so you will need to set width and height rev option values for each item, and also set scrolling:no.

Be aware that IE6 can't show transparent PNGs without help. DD_belatedPNG is a pretty good IE6 png helper that's easy to implement and works well.