There are many "box" scripts freely available on the net. To get an initial idea of which box is suitable for you, http://planetozh.com/projects/lightbox-clones might help you to pick some candidates.
This article attempts to do a comparison between these modules to allow you to choose which one best suits your needs. For the purposes of this comparison, the "lightbox" type functionality where content can be displayed in a container overlayed on the current page, whether it be for images, iframed content or videos, shall be referred to as a "lightbox".
As modules are constantly changing, this page is often not fully up to date, so use this page with some caution.