function that moves the stop loss and take profit levels if it is favorable to the open position on metatrader 4

mql Modify Open Order.mq4

// select the order http://docs.mql4.com/trading/orderselect
// OrderSelect(......
// then this method will work on the order selected
// bool result = ModifyOpenOrder(0.00300, 0.00900);
// returns true if the order was modified successfully
// returns false if the order didn't need modification or if modification failed

bool ModifyOpenOrder(double stopLossPips, double pipsProfit){
  bool modify = false;
  double   takeProfit;
  double   stopLoss;
  int orderType = OrderType();
  
  if(orderType == OP_BUY) {
    takeProfit = NormalizeDouble(Bid + pipsProfit, Digits);
    stopLoss = NormalizeDouble(Bid - stopLossPips, Digits);
    if(OrderStopLoss() < stopLoss) modify = true;
  }
  
  if(orderType == OP_SELL) {
    takeProfit = NormalizeDouble(Ask - pipsProfit, Digits);
    stopLoss = NormalizeDouble(Ask + stopLossPips, Digits);
    if(OrderStopLoss() > stopLoss) modify = true;
  }
  
  if(modify == true) {
    if(OrderProfit() < 0) {
       takeProfit = OrderTakeProfit();
    }
    
    bool result = OrderModify(OrderTicket(),OrderOpenPrice(),stopLoss,takeProfit,0,clrNONE);
    if(!result) {
      Print("Error in OrderModify. Error code=",GetLastError());
    }
    
    return result;
  }
  
  return false;
}

Nice one! Thanks for posting this!
Are you still coding for forex?