contract token {
  /* Public variables of the token */
  string public standard = 'Token 0.1';
  string public name;
  string public symbol;
  uint8 public decimals;
  uint256 public totalSupply;

  /* This creates an array with all balances */
  mapping (address => uint256) public balanceOf;
  mapping (address => mapping (address => uint256)) public allowance;

  /* This generates a public event on the blockchain that will notify clients */
  event Transfer(address indexed from, address indexed to, uint256 value);

  /* Initializes contract with initial supply tokens to the creator of the contract */
  function token(
  uint256 initialSupply,
  string tokenName,
  uint8 decimalUnits,
  string tokenSymbol
  ) {
    balanceOf[msg.sender] = initialSupply;              // Give the creator all initial tokens
    totalSupply = initialSupply;                        // Update total supply
    name = tokenName;                                   // Set the name for display purposes
    symbol = tokenSymbol;                               // Set the symbol for display purposes
    decimals = decimalUnits;                            // Amount of decimals for display purposes
  }

  /* Send coins */
  function transfer(address _to, uint256 _value) {
    if (balanceOf[msg.sender] < _value) throw;           // Check if the sender has enough
    if (balanceOf[_to] + _value < balanceOf[_to]) throw; // Check for overflows
    balanceOf[msg.sender] -= _value;                     // Subtract from the sender
    balanceOf[_to] += _value;                            // Add the same to the recipient
    Transfer(msg.sender, _to, _value);                   // Notify anyone listening that this transfer took place
  }

  /* Allow another contract to spend some tokens in your behalf */
  function approve(address _spender, uint256 _value)
  returns (bool success) {
    allowance[msg.sender][_spender] = _value;
    return true;
  }

  /* Approve and then communicate the approved contract in a single tx */
  function approveAndCall(address _spender, uint256 _value, bytes _extraData)
  returns (bool success) {
    tokenRecipient spender = tokenRecipient(_spender);
    if (approve(_spender, _value)) {
      spender.receiveApproval(msg.sender, _value, this, _extraData);
      return true;
    }
  }

  /* A contract attempts to get the coins */
  function transferFrom(address _from, address _to, uint256 _value) returns (bool success) {
    if (balanceOf[_from] < _value) throw;                 // Check if the sender has enough
    if (balanceOf[_to] + _value < balanceOf[_to]) throw;  // Check for overflows
    if (_value > allowance[_from][msg.sender]) throw;   // Check allowance
    balanceOf[_from] -= _value;                          // Subtract from the sender
    balanceOf[_to] += _value;                            // Add the same to the recipient
    allowance[_from][msg.sender] -= _value;
    Transfer(_from, _to, _value);
    return true;
  }

  /* This unnamed function is called whenever someone tries to send ether to it */
  function () {
    throw;     // Prevents accidental sending of ether
  }
}
function approve(address _spender, uint256 _value)
returns (bool success) {
  allowance[msg.sender][_spender] = _value;
  return true;
}

/* Allow another contract to spend some tokens in your behalf */