ModalBox is a JavaScript technique for creating modern Web 2.0 style modal dialogs or even wizards (sequences of dialogs) without using conventional popups and page reloads. It’s inspired by Mac OS X modal dialogs.
This Free Modal box Popup Script is built with pure JavaScript and is based on Prototype JavaScript Framework, script.aculo.us and valid XHTML/CSS.
ModalBox uses AJAX to load content and it does the automatic height adjustment. It’s very easy to customize ModalBox via CSS.
This Free Modal box popup script works in all modern browser and is best crack for popup blockers.
Website: http://okonet.ru/projects/modalbox/