Code:
vars StopCal = series(ATR(14));
var HighATR = MaxVal(StopCal,14);
var LowATR =	MinVal(StopCal,14);


but why add .25 of the difference between high and low atr values to the gap between price and sma:

(HighATR-LowATR)*.25

Not sure what this adds to your stop & trail, it's likely to be a very small % of ATR.