In case you’re not familiar, this is one of many latest trends in the “web 2.0” world.
For example, Lightbox JS is a rather simple script that produces an effect when clicking a specified link on a page. It makes that page appear to be in the background (un-usable) while highlighting an image or some other content.
Many “up-beat” commercial sites are using this technique.
[Source: huddletogether.com]