rem: if (!(element = $(element))) return; return Element.classNames(element).add(className); 
add: element = $(element); Element.removeClassName(element, className); element.className += ' ' + className; 
context:   addClassName: function(element, className) {    if (!(element = $(element))) return;    return Element.classNames(element).add(className);  },
meta: 3991	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/3991/57687341792749db94b850962ee7ed7f18e1087d/prototype.js/clean/manager/media/script/scriptaculous/prototype.js