rem: Element.classNames(element).add(className); 
add: if (!element.hasClassName(className)) element.className += (element.className ? ' ' : '') + className; 
context:   addClassName: function(element, className) {    if (!(element = $(element))) return;    Element.classNames(element).add(className);    return element;  },
meta: 8434	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/8434/6873fc8026e87544ee93e0d9551ae57083313cff/prototype.js/buggy/vendor/rails/actionpack/lib/action_view/helpers/javascripts/prototype.js