I recently made a really lightweight modal box to use on one of our projects LessPlan. There was a need to have a instance of tinyMCE within a modal/lightbox when creating a lesson plan.
What I found was most existing modal/lightbox plugins was that they were incompatible with tinyMCE because they cloned the contents of a specified div before placing it into the actual lightbox container.
LightModal does away with the cloning and makes the content itself turn into a lightbox, therefore throwing away the need to clone the html.
It’s written in CoffeeScript as a jquery plugin and includes tests written with Jasmine BDD testing framework. Released under the MIT licence.