See: http://stackoverflow.com/questions/6865081/add-subscript-to-numbers-on-the-fly-as-user-types-using-jquery
jQuery 1.6.2, HTML, CSS, JavaScript
jQuery 1.6.1, HTML, CSS, JavaScript
No-Library (pure JS), HTML, CSS, JavaScript
See:http://stackoverflow.com/questions/6538546/jquery-animated-text/6538963#6538963
Mootools 1.3.2, HTML, CSS, JavaScript
jQuery 1.6, HTML, CSS, JavaScript