SimpleModal is a lightweight jQuery Plugin which provides a powerful interface for modal dialog development. Think of it as a modal dialog framework.
SimpleModal gives you the flexibility to build whatever you can envision, while shielding you from related cross-browser issues inherent with UI development..
As you can see by this example, SimpleModal can be easily configured to behave like an OSX dialog. With a handful options, 2 custom callbacks and some styling, you have a visually appealing dialog that is ready to use!