No-Library (pure JS), HTML, CSS, JavaScript
Mootools 1.4.4, HTML, CSS, JavaScript
jQuery 1.6.2, HTML, CSS, JavaScript
SO http://stackoverflow.com/q/12086548/570918
jQuery 1.9.1, HTML, CSS, JavaScript
jQuery 1.7, HTML, CSS, JavaScript
jQuery 1.8.3, HTML, CSS, JavaScript
testing to see if using input event works better than change