jQuery - Microsoft Official Supported Visual Studio Javascript Library

http://en.wikipedia.org/wiki/JQuery

http://jquery.com/

http://weblogs.asp.net/scottgu/archive/2008/11/21/jquery-intellisense-in-vs-2008.aspx

SimpleModal

SimpleModal is a lightweight jQuery plugin that provides a simple interface to create a modal dialog.

http://www.ericmmartin.com/projects/simplemodal/