rem: Element.classNames(element).remove(className); 
add: element.className = element.className.replace( new RegExp("(^|\\s+)" + className + "(\\s+|$)"), ' ').strip(); 
context:   removeClassName: function(element, className) {    if (!(element = $(element))) return;    Element.classNames(element).remove(className);    return element;  },
meta: 9100	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/9100/2d4247a14ff4ce25ad80cbc65b787dfde7ddb16e/prototype.js/buggy/typo3/contrib/prototype/prototype.js