contract JointOwnable is Ownable {

  event AnotherOwnerAssigned(address indexed anotherOwner);

  address public anotherOwner1;
  address public anotherOwner2;

  /**
   * @dev Throws if called by any account other than the owner or anotherOwner.
   */
  modifier eitherOwner() {
    require(msg.sender == owner || msg.sender == anotherOwner1 || msg.sender == anotherOwner2);
    _;
  }

  /**
   * @dev Allows the current owner to assign another owner.
   * @param _anotherOwner The address to another owner.
   */
  function assignAnotherOwner1(address _anotherOwner) onlyOwner public {
    require(_anotherOwner != 0);
    AnotherOwnerAssigned(_anotherOwner);
    anotherOwner1 = _anotherOwner;
  }

  /**
   * @dev Allows the current owner to assign another owner.
   * @param _anotherOwner The address to another owner.
   */
  function assignAnotherOwner2(address _anotherOwner) onlyOwner public {
    require(_anotherOwner != 0);
    AnotherOwnerAssigned(_anotherOwner);
    anotherOwner2 = _anotherOwner;
  }

}
/**
 * @title JointOwnable
 * @dev Extension for the Ownable contract, where the owner can assign at most 2 other addresses
 *  to manage some functions of the contract, using the eitherOwner modifier.
 *  Note that onlyOwner modifier would still be accessible only for the original owner.
 */
function assignAnotherOwner2(address _anotherOwner) onlyOwner public {
    require(_anotherOwner != 0);
    AnotherOwnerAssigned(_anotherOwner);
    anotherOwner2 = _anotherOwner;
  }
/**
 * @dev Allows the current owner to assign another owner.
 * @param _anotherOwner The address to another owner.
 */