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".
The Overview section is a few years out of date (written at the time of Firefox 3.x and IE 7) with the exception of the Module Overview table which is current as of May 2012. The Available Modules section is also current as of May 2012.
This article was written by the current maintainer of the Lightbox2 module but aims to provide an unbiased and fair comparison.