rem: return destination; 
add:  element._extended = true; return element; 
context: Object.extend = function(destination, source) {  for (property in source) {    destination[property] = source[property];  }  return destination;}
meta: 6601	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/6601/28b3187d07d97712c23182569a4d6fd00900b5f7/prototype.js/buggy/javascript/prototype/prototype.js