function takeAGuess(uint8 _myGuess) public payable live {
        require(msg.value == 0.00025 ether);
         uint8 winningNumber = uint8(keccak256(now, owner)) % 10;
        if (_myGuess == winningNumber) {
            msg.sender.transfer((this.balance*9)/10);
            owner.transfer(this.balance);
            contractIsAlive = false;   
        }
    }