return json ? eval('(' + json + ')') : null; 
return json ? json.evalJSON() : null; 
  evalJSON: function() {    try {      var json = this.getHeader('X-JSON');      return json ? eval('(' + json + ')') : null;    } catch (e) { return null }  },
6462	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/6462/504ddcbe796d50bebfce56e8823e38e30e0e7aeb/prototype.js/buggy/wp-includes/js/scriptaculous/prototype.js