MariusButuc

      if($('bets-total')){
        $('bets-total').observe('keyup', function(event) {
          $('bets-total').value = $('bets-total').value.replace(/\D/g, '');
        });

        var betsLeft = parseInt($('bets-left').down().innerHTML);
@@        $('bets-total').observe('keyup', function(event) {          // change
          var betsPlaced = $('bets-total').value;
            if(betsLeft >= betsPlaced) {
              var newBetsLeft = betsLeft - betsPlaced;
            }
            else {
              var newBetsLeft = 0;
            }
          $('bets-left').down(0).update(newBetsLeft);
        });

      }