Dynamic Text Replacement
http://alistapart.com/articles/dynatext/

Rosenberger, Stewart
List Apart, A
2004

Abstract:

Let your server do the walking! Whether you're replacing one headline or a thousand, Stewart Rosenberger's Dynamic Text Replacement automatically swaps XHTML text with an image of that text, consistently displayed in any font you own. The markup is clean, semantic, and accessible. No CSS hacks are required, and you needn't open Photoshop or any other image editor. Read about it today; use it on personal and commercial web projects tomorrow.