Carpentry and Woodworking - glass countertop

Anyone ever set glass in/on wood? I'll be using a 1/4" thick piece of glass (to cover photographs) for a kitchen island top. My question is: should I have the piece cut an extra 1/4" so that I can let it "sit" in grooves of the border trim? Or should I have it cut exactly the size of the photo collage, and either use some sort of clear caulk/adhesive, or perhaps just let it "float." --the appeal of letting it float is that a sponge could then wipe the table and not meet a lip where the glass meets the wood trim.
(the photo collage sits on a 3/4" thick piece of plywood - about 2' x 3'.)

Any thoughts at all are appreciated.
S.D.P.

There are available little plastic disks that go under glass to keep if from sitting directly on a surface. I imagine that a glass supplier has them. They appear to be quite thin, but keep the glass from being directly on the surface.

Hope this helps.

my mother-in-law has a really old one, have it cut so that it sits in the groves & have the edges polished, see if they can give you some way to get it out without using a pry,

[QUOTE]Originally posted by gordypoo
"my mother-in-law has a really old one, have it cut so that it sits in the groves & have the edges polished, see if they can give you some way to get it out without using a pry."

I'm with you on using the grooves because it's very important that liquid does not get under the glass and ruin the photographs. And, what's the advantage of polished edges? Less brittle? (and less sharp...)
Also, I should have said that the glass will be placed directly over the photo's to keep them flat, so I'm not sure about using the discs, or where to place them if I did use them, because of the risk of getting moisture under the glass and on the photo's.
The grooves - should I make them hidden? Or should I remove a 1/4" on top of the trim for the glass to sit on? I think the main concern is getting moisture or liquid under the glass, and having the glass and wood trim being the same level seems the best way to avoid that. (think dragging a damp sponge across the glass to the wood edges...)

Thanks for the help thus far,
Sampson.

the advantage of polished edges are, no sharp edges, are you planing on useing this area as a kitchen work area, if so the glass is going to get scratched,