contract tokenRecipient {
      event receivedEther(address sender, uint amount);
      event receivedTokens(address _from, uint256 _value, address _token, bytes _extraData);

      function receiveApproval(address _from, uint256 _value, address _token, bytes _extraData) {
          Token t = Token(_token);
          require (!t.transferFrom(_from, this, _value));
          receivedTokens(_from, _value, _token, _extraData);
      }

      function () payable {
          receivedEther(msg.sender, msg.value);
      }
  }

  contract Token {
      function transferFrom(address _from, address _to, uint256 _value) returns (bool success);
  }