crowdsale.sol

pragma solidity ^0.4.8;

import "token.sol";

contract Crowdsale {

  address public owner;
  Token public rewardToken;
  
  bool started = false;
  uint tokenETH = 100;
  
  modifier onlyOwner {
    require(msg.sender == owner);
    _;
  }

  function Crowdsale() {
    owner = msg.sender;
  }
  
  function start(address rewardTokenAddress) onlyOwner {
    rewardToken = Token(rewardTokenAddress);
    started = true;
  }
  
  function stop() onlyOwner {
    started = false;
  }
  
  function destroy() onlyOwner {
    rewardToken.transfer(owner, rewardToken.balanceOf(this));
    selfdestruct(owner);
  }
  
  function () payable {
    require(started);
    uint amount = msg.value * tokenETH;
    require(rewardToken.balanceOf(this) >= amount);
    rewardToken.transfer(msg.sender, amount);
  }
 
}