Double Smoothed Stochastic by Bekzhan

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//  Copyright by Bekzhan v1.0 24/11/2014
// Double Smoothed Stochastics (DSS) is designed by William Blaw. 
// It attempts to combine moving average methods with oscillator principles. 
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study(title="Double Smoothed Stochastic", shorttitle="DSS Bekzhan")
PDS = input(10, minval=1)
EMAlen = input(9, minval=1)
TriggerLen = input(5, minval=1)
Overbought = input(80, minval=1)
Oversold = input(20, minval=1)
hline(Overbought, color=green, linestyle=line)
hline(Oversold, color=red, linestyle=line)
xPreCalc = ema(stoch(close, high, low, PDS), EMAlen)
xDSS = ema(stoch(xPreCalc, xPreCalc, xPreCalc, PDS), EMAlen)
//xDSS = stoch(xPreCalc, xPreCalc, xPreCalc, PDS)
xTrigger = ema(xDSS, TriggerLen)
plot(xDSS, color=blue, title="DSS")
plot(xTrigger, color=red, title="Trigger")