dao solidity

dao.sol

contract SendBalance {
  mapping (address => uint) userBalances;
  bool withdrawn = false;
  function getBalance(address u) constant returns (uint) {
    return userBalances[u];
  }

  function addToBalance() {
    userBalances[msg.sender] += msg.value;
  }

  function withdrawBalance() {
    if (!(msg.sender.call.value(userBalances[msg.sender])())) {
      throw;
    }

    userBalances[msg.sender] = 0;
  }
}