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: 1782	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/1782/a458ebb30ee90b66048c7fd858f5f39957a9be68/prototype.js/clean/webapp/sandbox/scripts/prototype.js