rem: var klass = window['HTML' + tag + 'Element'] = {}; 
add: var className = 'HTML' + tag + 'Element'; if(window[className]) return; var klass = window[className] = {}; 
context:   ['', 'Form', 'Input', 'TextArea', 'Select'].each(function(tag) {    var klass = window['HTML' + tag + 'Element'] = {};    klass.prototype = document.createElement(tag ? tag.toLowerCase() : 'div').__proto__;  });
meta: 669	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/669/fe39ac7e56c5efaa3995353cdabb432a23229633/prototype.js/buggy/actionpack/lib/action_view/helpers/javascripts/prototype.js