rem: return Element.classNames(element).include(className); 
add: var elementClassName = element.className; if (elementClassName.length == 0) return false; if (elementClassName == className || elementClassName.match(new RegExp("(^|\\s)" + className + "(\\s|$)"))) return true; return false; 
context:   hasClassName: function(element, className) {    if (!(element = $(element))) return;    return Element.classNames(element).include(className);  },
meta: 2801	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/2801/7e143d2df37946a5416f0f043869478087652eb6/prototype.js/clean/examples/testcases/prototype.js