function moneyBack() internal {
		require(!commission[msg.sender]);
		require(deposit[msg.sender] > 0);
		require((block.timestamp.sub(checkpoint[msg.sender])).div(1 days) < 7);
		
		msg.sender.transfer(deposit[msg.sender]);
		
		deposit[msg.sender] = 0;
		commission[msg.sender] = false;
	}