Code

here is the code:
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plot Data = close;
declare lower;

input price = close;
input emAverage = 20;
input smAverage = 20;

def ELeader = emAverage;
def SimLag = smAverage;

def lag = 0.00;
def lag2 = 1.00;

#plot ZeroLine = 0;
#ZeroLine.SetDefaultColor(GetColor(1));

plot ESLine = ExpAverage(price, ELeader) - Average(price, SimLag);
ESLine.SetDefaultColor (Color.YELLOW);

ESLine.AssignValueColor (if ESLine[lag] >= ESLine[lag2]
then Color.GREEN else Color.RED);

ESLine.SetLineWeight(2);