The library is lightweight (5kb) and supports images, iframes, HTML and Ajax requests natively.
Modal windows are very flexible with the options like toggle animation, auto-hide, opacity level, custom positions and more.
And, they can be closed by simply clicking on the close button, anywhere outside the modal box or ESC.
There are callback functions for the open + close events and the windows can be set to load in a specific size or the width/height (auto) of the content to be displayed.
Compatibility: Tested in IE7+, FF, Chrome, Opera, and Safari