Looking for Video Interruption-like Device

[JOSHSKORN]

I don't even know if this is the right overall forum for something like this but maybe someone can help me.

I work in a library, where, in the Childrens section, we have what we call a "Green Screen". Basically, it's a green wall where you can stand against while a camera looks at you and shows you in different environments (i.e. the wilderness, outer space, a big city, etc.). This machine is run on a computer. I do not know the specifics of the computer it runs on as I am not in that department.

You could imagine how loud patrons (mainly children) get while "dorking-out" while they're on this TV. I would like to install some sort of push button under the Childrens reference desk, which would temporarily display an image (basically telling them to shut up in a nice way). My guess is that this would probably have to be wireless. There is approximately 40 feet in between the desk and this TV.

That said, what kind of device can I use to change the video source, either automatically for about 5 seconds, or while I'm holding the button down? Please link me to a specific device. Any input would be appreciated. Thanks.

 

[bloodypulp]

if it's a TV, why not just use the TV remote to switch input source?
if it's a monitor, an HDMI switch should work http://www.monoprice.com/products/product.asp?c_id=101&cp_id=10110&cs_id=1011002&p_id=8462&seq=1&format=2#description

 

[JOSHSKORN]

if it's a TV, why not just use the TV remote to switch input source?
if it's a monitor, an HDMI switch should work http://www.monoprice.com/products/product.asp?c_id=101&cp_id=10110&cs_id=1011002&p_id=8462&seq=1&format=2#description

Again, I'm looking for something that is more of a full solution. I basically want a button (maybe about roughly an inch in diameter) that triggers a temporary change in the video input. I'd like it to be wireless.