rem: element = $(element); Element.removeClassName(element, className); element.className += ' ' + className; 
add: if (!(element = $(element))) return; return Element.classNames(element).add(className); 
context:   addClassName: function(element, className) {    element = $(element);    Element.removeClassName(element, className);    element.className += ' ' + className;  },
meta: 3991	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/3991/d29159eae8749c508d01bb447868321a3ba6bbfa/prototype.js/buggy/manager/media/script/scriptaculous/prototype.js