rem: toColorPart: function() { var digits = this.toString(16); if (this < 16) return '0' + digits; return digits; }, 
add: Number.prototype.toColorPart = function() { var digits = this.toString(16); if (this < 16) return '0' + digits; return digits; } 
context:   toColorPart: function() {    var digits = this.toString(16);    if (this < 16) return '0' + digits;    return digits;  },
meta: 7994	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/7994/a2c6b493070c56ddf61aed9bf1fb5f9b3b94aa80/prototype.js/clean/lib/prototype.js