Mounting photos to display board

Does anyone have a solution for temporarily mounting photos up to 16x20 to foamboard?

My wife and I are hosting the Glen of Imaal "Meet the Breeds" booth at the AKC/Eukanuba dog show next month in Orlando. I bought a couple of trifold 3'x6' project foam boards at HLobby and I need to mount some 15 to 20 pictures to the board. I initially thought to simply use thumbtacks as it makes mounting a snap.

Now I'm having second thoughts. I'd rather not punch holes in my pictures and I'd like to have a more professional look (barring the fact I'm using project board to start with). My wife says they still make those little paper triangle wedges with the glue backing we used 50 yrs ago to attach pictures to photobooks. Surely in 50 yrs they have come up with something better and if they haven't, will the glue stick to foamboard? Thanks.

Probably a (very) small dab or two of rubber cement or a light dab with a glue stick as you thought.

One additional thought is that you may re-use this display again and again, so why not afix the images to the foam backerboard using 3M adhesive spray (be careful with this because it is extremely sticky and once the image & glue touch, it IS where it is...[don't ask me how I know]).

the way we always did it in photo class was with an iron press. And its better to use a real mounting board to put the photo on. but heres how you do it! http://www.inficad.com …rt/photo_mounti​ng_101.htm

I actually stumbled across this the other day while at Dick Blick's picking up some foam core. According to the employee, these sprays allow you to remove the photo from the surface unlike a normal glue.

http://www.dickblick.c​om …itionable-spray-adhesive/
http://www.amazon.com …10-25-Ounce/dp/B000BKQD82

The only problem is that you're still going to have the tacky residue on the photo after you've unmounted it, so you'll need something else to stick it to when it's not mounted to the board.