function adjustLimitBetweenIssueAndNormal(uint256 _amount, bool _isAddToNormal) onlyOwner initialized contributionOpen {
      if(_isAddToNormal)
      {
          require(totalIssueTokenGenerated.add(_amount) <= maxIssueTokenLimit);
          maxIssueTokenLimit = maxIssueTokenLimit.sub(_amount);
          maxFirstRoundTokenLimit = maxFirstRoundTokenLimit.add(_amount);
      } else {
          require(totalNormalTokenGenerated.add(_amount) <= maxFirstRoundTokenLimit);
          maxFirstRoundTokenLimit = maxFirstRoundTokenLimit.sub(_amount);
          maxIssueTokenLimit = maxIssueTokenLimit.add(_amount);
      }
  }