N:=14;
WR:-100*(HHV(HIGH,N)-CLOSE)/(HHV(HIGH,N)-LLV(LOW,N));
if CROSS(WR,-80) or CROSS(WR,-20) then
begin
sellshort(1,holding,market);
buy(holding=0,1,market);
end
if CROSS(-80,wr) or CROSS(-20,wr) then
begin
sell(1,holding,market);
buyshort(holding=0,1,market);
end