this.set(this.select(function(className) { return className != classNameToRemove; }).join(' ')); 
depth.times(function(){ div = div.firstChild }); 
    this.set(this.select(function(className) {      return className != classNameToRemove;    }).join(' '));
6445	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/6445/81ea0800bc8ad92d491743716cd489cad7333723/prototype.js/buggy/vendor/rails/actionpack/lib/action_view/helpers/javascripts/prototype.js