/* Prototypes */
String.prototype.format = function() {
  var args = arguments;
  return this.replace(/{(\d+)}/g, function(match, number) { 
    return typeof args[number] != 'undefined'
      ? args[number]
      : match
    ;
  });
};

String.prototype.trim = function() {
  return this.replace(/^\s\s*/, '').replace(/\s\s*$/, '');
};