rem: this.element.className.split(/\s+/).select(function(name) { return name.length > 0; })._each(iterator); 
add: $H(extras).each(function(pair) { headers[pair.key] = pair.value }); 
context:     this.element.className.split(/\s+/).select(function(name) {      return name.length > 0;    })._each(iterator);
meta: 1164	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/1164/cb2408a82c9bc93bef177dc33a8981bc36800839/prototype.js/buggy/tools/prototype.js