jQueryUIConfirm is the simplest way to integrate jQuery UI dialog as confirmation window on an Asp.Net website.
You can include html into window’s message, customize the title and the text of the buttons. This control can be included into a bindable control (Repeater, DataList, ListView, ecc…), and it automatically sniffs any validators you’ve put on the button.
And it’s fully themeable by standards jQuery UI theme, it exposes nearly every jQuery UI configuration property.
Update 21/02/2010: Fixed a bug involving masterpages.