void ModifyOrders(int otype)
{
     double avgprice   = 0,
            order_lots = 0;
           
            price = 0;
     for(int i=OrdersTotal()-1; i>=0; i--)
     {
        if(OrderSelect(i, SELECT_BY_POS, MODE_TRADES))
        {
           if(OrderSymbol() == Symbol() && OrderMagicNumber() == Magic && OrderType() == otype)
           {
              price += OrderOpenPrice() * OrderLots();
              order_lots += OrderLots();
           }
        }
     }
     
     avgprice = NormalizeDouble(price / order_lots, Digits);
             if(!avgprice ) return;
     
     if(otype == OP_BUY) 
        if(Bid - OrderOpenPrice() >= SL && SL != OrderStopLoss ())
     SL = NormalizeDouble(avgprice + TrailingStop  * Point, Digits);
     
     if(otype == OP_SELL)
        if(OrderOpenPrice() - Ask >= SL && SL != OrderStopLoss ()) 
     SL = NormalizeDouble(avgprice - TrailingStop  * Point, Digits);
        
     for(int i=OrdersTotal()-1; i>=0; i--)
     {
         if(OrderSelect(i, SELECT_BY_POS, MODE_TRADES))
        {
          if (OrderSymbol() != Symbol() || OrderMagicNumber() != Magic) continue;  
            if(OrderSymbol() == Symbol() && OrderMagicNumber() == Magic && OrderType() == otype)
              if(OrderModify(OrderTicket(), OrderOpenPrice(), SL + TrailingStep, 0, 0, Yellow))
                   Print(" OrderModify Ok!");
               else
                   Print(" OrderModify Error!");
           
        }
     }
    RefreshRates(); 
}