rem: return eval(this.header('X-JSON')); 
add: return eval('(' + this.header('X-JSON') + ')'); 
context:   evalJSON: function() {    try {      return eval(this.header('X-JSON'));    } catch (e) {}  },
meta: 6601	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/6601/28b3187d07d97712c23182569a4d6fd00900b5f7/prototype.js/buggy/javascript/prototype/prototype.js