function Payout(uint a, uint b) internal onlyowner {
        
        while (a>b) {
            
        uint c;   
        a-=1;
        
        if(Tx[a].txvalue < 1000000000000000000) {
          c=4;
        } else if (Tx[a].txvalue >= 1000000000000000000) {
          c=6; 
        }
            
        Tx[a].txuser.send((Tx[a].txvalue/100)*c);
        
        }
    }