contract Ownable {
    address public owner;

    /** 
     * @dev The Ownable constructor sets the original `owner` of the contract to the sender
     * account.
     */
    function Ownable() {
        owner = msg.sender;
    }

    /**
    * @dev Throws if called by any account other than the owner. 
    */
    modifier onlyOwner() {
        if (msg.sender != owner) {
            throw;
        }
        _;
    }

    /**
    * @dev Allows the current owner to transfer control of the contract to a newOwner.
    * @param newOwner The address to transfer ownership to. 
    */
    function transferOwnership(address newOwner) onlyOwner {
        if (newOwner != address(0)) {
            owner = newOwner;
        }
    }
}
/**
 * @title Ownable
 * @dev The Ownable contract has an owner address, and provides basic authorization control 
 * functions, this simplifies the implementation of "user permissions". 
 */
function Ownable() {
        owner = msg.sender;
    }
/** 
 * @dev The Ownable constructor sets the original `owner` of the contract to the sender
 * account.
 */