uint256 constant INITIAL_SUPPLY = 1234 * 10**18;

function StandardToken() public {
    balance[msg.sender] = INITIAL_SUPPLY;
}

function Crowdsale(uint256 _startTime, uint256 _endTime, uint256 _rate, address _wallet) public {
    require(_startTime >= now);
    require(_endTime >= _startTime);
    require(_rate > 0);
    require(_wallet != address(0));

    startTime = _startTime;
    endTime = _endTime;
    rate = _rate;
    wallet = _wallet;
    token = createTokenContract();
}