Object.prototype.clone = function() {
 var copy = (this instanceof Array) ? [] : {};
 for (attr in this) {
  if (!obj.hasOwnProperty(attr)) continue;
  copy[attr] = (typeof this[i] == "object")?obj[attr].clone():obj[attr];
 } 
 return copy;
};


a = {k1:1, k2:2, k3:3};
b = a.clone();

function clone(obj) {
  // Handle the 3 simple types, and null or undefined
  if (null == obj || "object" != typeof obj) return obj;

  // Handle Date
  if (obj instanceof Date) {
    var copy = new Date();
    copy.setTime(obj.getTime());
    return copy;
  }

  // Handle Array
  if (obj instanceof Array) {
    var copy = [];
    for (var i = 0, var len = obj.length; i < len; ++i) {
      copy[i] = clone(obj[i]);
    }
    return copy;
  }

  // Handle Object
  if (obj instanceof Object) {
    var copy = {};
    for (var attr in obj) {
      if (obj.hasOwnProperty(attr)) copy[attr] = clone(obj[attr]);
    }
    return copy;
  }

  throw new Error("Unable to copy obj! Its type isn't supported.");
}