contract Pausable is Ownable {
   event Pause();
   event Unpause();

   bool public paused = false;


   /**
    * @dev Modifier to make a function callable only when the contract is not paused.
    */
   modifier whenNotPaused() {
     require(!paused);
     _;
   }

   /**
    * @dev Modifier to make a function callable only when the contract is paused.
    */
   modifier whenPaused() {
     require(paused);
     _;
   }

   /**
    * @dev called by the owner to pause, triggers stopped state
    */
   function pause() onlyOwner whenNotPaused public {
     paused = true;
     emit Pause();
   }

   /**
    * @dev called by the owner to unpause, returns to normal state
    */
   function unpause() onlyOwner whenPaused public {
     paused = false;
     emit Unpause();
   }
 }
function pause() onlyOwner whenNotPaused public {
  paused = true;
  emit Pause();
}

/**
 * @dev called by the owner to pause, triggers stopped state
 */