rem: return this.slice(0, this.length - 1) + String.fromCharCode(this.charCodeAt(this.length - 1) + 1); 
add: return this + 1; 
context:   succ: function() {    return this.slice(0, this.length - 1) +      String.fromCharCode(this.charCodeAt(this.length - 1) + 1);  },
meta: 9100	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/9100/2d4247a14ff4ce25ad80cbc65b787dfde7ddb16e/prototype.js/buggy/typo3/contrib/prototype/prototype.js