Creating a “box-webpage” upon click

[artyom]

I'm trying to accomplish something that might be relatively simple, but I don't know what I would call it (if there is a specific name for it), hence my searches have proved useless. What I'm trying to accomplish is simple: I have a page built off off the Masonry jquery plugin (similar to http://designshack.net/tutorialexamples/masonry/demos/masonry.html). All I want to do is that when I click on a specific picture, it creates a "box" that fills up part of the screen and can contain another webpage (to describe the picture) while fading out most of the background. Then when I click outside of the box, it returns to all of my pictures.I've seen this before, as I'm sure everybody else has, but for the life of me I cannot remember an example to look at or how best to do this. I don't have too much experience with javascript or jquery (which is why I'm asking this), but any help to point me in the right direction, whether it is using javascript or html/css, would be great. If anybody does get the gist of what I'm describing and can explain it better, then you're more than welcome to edit..