RSI - With Overbought & Oversold coloured for Amibroker (AFL)

This is RSI Indicator, with coloured Overbought and Oversold area , to make easier to analyze.
Here is a screenshot of how the indicator looks:

_SECTION_BEGIN("RSI");
SetChartOptions(0,0,ChartGrid30|ChartGrid70,0,100);
periods = Param( "Periods", 14, 1, 200, 1 );
z = RSI( periods);

RSILineColor = ParamColor("RSI Line Color",ColorRGB(127,0,83));
RSIOverboughtColor = ParamColor("RSI Overbought Color",ColorRGB(127,0,83));
RSIOversoldColor = ParamColor("RSI Oversold Color",colorRed);


Plot( z, _DEFAULT_NAME(), RSILineColor , styleLine  );
Plot( 50, _DEFAULT_NAME(), RSILineColor , styleDashed|styleNoTitle  );
Plot( 70, _DEFAULT_NAME(), RSILineColor , styleLine|styleNoTitle  );
Plot( 30, _DEFAULT_NAME(), RSILineColor , styleLine|styleNoTitle  );
PlotOHLC(z,z,50,z,"",IIf(z>50,RSIOverboughtColor,RSIOversoldColor),styleCloud|styleClipMinMax,30,70);


_SECTION_END();