Help with alerts

[acford2]

Hey guys I was wondering if anyone could help me with adding an alert bell when this changes from green to red and red to green, respectively?

declare lower;

input length = 10;
input paintBars = yes;
input averageType = AverageType.WILDERS;

def diPlus = DMI(length, averageType)."DI+";
def diMinus = DMI(length, averageType)."DI-";

plot Osc = diPlus - diMinus;
plot Hist = Osc;
plot ZeroLine = 0;

Osc.SetDefaultColor(GetColor(1));
Hist.SetPaintingStrategy(PaintingStrategy.HISTOGRAM);
Hist.SetLineWeight(3);
Hist.DefineColor("Positive", Color.UPTICK);
Hist.DefineColor("Negative", Color.DOWNTICK);
Hist.AssignValueColor(if Hist > 0 then Hist.Color("Positive") else Hist.Color("Negative"));
Hist.HideTitle();
ZeroLine.SetDefaultColor(Color.GRAY);

DefineGlobalColor("Positive", Color.UPTICK);
DefineGlobalColor("Negative", Color.DOWNTICK);
AssignPriceColor(if !paintBars
    then Color.CURRENT
    else if Osc > 0
        then GlobalColor("Positive")
        else GlobalColor("Negative"));

 

[BenTen]

Add this to the bottom of your script:

# Alert
Alert(Hist crosses above ZeroLine, "Positive Crossover", Alert.Bar, Sound.Chimes);
Alert(Hist crosses below ZeroLine, "Negative Crossover", Alert.Bar, Sound.Chimes);

 

[acford2]

Add this to the bottom of your script:

# Alert
Alert(Hist crosses above ZeroLine, "Positive Crossover", Alert.Bar, Sound.Chimes);
Alert(Hist crosses below ZeroLine, "Negative Crossover", Alert.Bar, Sound.Chimes);

Thank you so much