int start()
{
int totalorders = OrdersTotal();
for(int i=totalorders-1;i>=0;i--)
{
OrderSelect(i, SELECT_BY_POS);
{
if (OrderSymbol()==Symbol()&& OrderType() == OP_BUY ) {
OrderClose( OrderTicket(), OrderLots()/2, MarketInfo(OrderSymbol(), MODE_BID), 0, Red );
}        
if (OrderSymbol()==Symbol()&& OrderType() == OP_SELL ) {
OrderClose( OrderTicket(), OrderLots()/2, MarketInfo(OrderSymbol(), MODE_ASK), 0, Red );

}
}
}
return;
}