Force - Williams%r alert arrow indi

i want indicator to compare force index momentum rsi with williams wich is not easy, so i want to compare them to create signal alert + arrows, something like this. the rest on private. 

- Compare last 100 bars highest high and 100 bars lower lows of FORCE INDEX, save those values. - Take them to a 100 scale: - Force last 100 bars highest highs = value1 (positive) - Force last 100 bars lowest lows = value2 (negative) - if Close[0] > (value1-value1/5) &&(Williams%R >-20) then = arrow down - if Close[0] < (value2+value2/5) &&(Williams%R <-80) then = arrow down