DHTML

Dynamic HTML (DHTML) is a Microsoft enhancement to HTML version 4.0 that lets you create special effects, such as text that flies off the page one word at a time, or rotating billboard-style transition effects between pages.
(DHTML) An extension of the HTML language that enables the creation of presentation effects for text and objects. In FrontPage, you can use the DHTML Effects toolbar to add effects to page elements without the need to know programming.