Change AFL to Tradescript

Algos, strategies, code
1 
_SECTION_BEGIN("Price");
SetChartOptions(0,chartShowArrows|chartShowDates);
_N(Title = StrFormat("{{NAME}} - {{INTERVAL}} {{DATE}} Open %g, Hi %g, Lo %g, Close %g (%.1f%%) {{VALUES}}", O, H, L, C, SelectedValue( ROC( C, 1 ) ) ));
Plot( C, "Close", ParamColor("Color", colorBlack ), styleNoTitle | ParamStyle("Style") | GetPriceStyle() ); 
_SECTION_END();

_SECTION_BEGIN("EMA");

Range1=Optimize("range1",14,1,20,1);
Range2=Optimize("range2",206,1,125,1);

Buy = Cross((EMA(Close,range1)),(EMA(Close,range2))); 
Sell = Cross(EMA(Close,range2),(EMA(Close,range1))); 
Short = Sell; 
Cover = Buy; 

// plot expanded average 

Plot(EMA( Close,range1), "70min-ema", colorRed ); 
Plot(EMA( Close,range2), "1030min-ema", colorGreen ); 

// plot arrows
shape = Buy * shapeUpArrow + Sell * shapeDownArrow;
PlotShapes( shape, IIf( Buy, colorGreen, colorRed ), 0, IIf( Buy, Low, High ) );

_SECTION_END();
2

 explain in brief  is 

Range1=Optimize("range1",14,1,20,1);
Range2=Optimize("range2",206,1,125,1);

is that Optimize values above or OHLC values? or number of periods

if so,   as per the above buy and sell condtion

​Buy Script:

CROSSOVER(EMA(CLOSE,14),EMA(CLOSE,21))

Sell Script:

CROSSOVER(EMA(CLOSE,21),EMA(CLOSE,14))