Stochstic with D Slow Color

[Trader9]

i want Stochastic with D Slow color, i make some changes but i am not getting indicator perfectly.
i have given modified script given below, please check it and tell me what is wrong , and how do i do it.

Thank you

script :---


/************************************************** ***************
Provided By : eSignal. (c) Copyright 2003
Description: Stochastics with D Slow

Version: 2.0

2.0 Notes:
- Updated parameters to use FunctionParameter Class.
- Added parameter to turn on/off display of %K.
- Added parameters to allow user control over study colors.

************************************************** ***************/

addBand(80, PS_SOLID, 2, Color.yellow, "top");
addBand(20, PS_SOLID, 2, Color.yellow, "bottom");

function preMain() {
setStudyTitle("Stochastics with D Slow ");
setStudyMin(-5);
setStudyMax(105);
setShowTitleParameters(false);
setDefaultBarFgColor(Color.blue, 0); // %K
setDefaultBarFgColor(Color.red, 1); // %D
setDefaultBarFgColor(Color.brown, 2); // %D Slow


setCursorLabelName("\%K", 0);
setCursorLabelName("\%D", 1);
setCursorLabelName("\%D Slow", 2);

var fp1 = new FunctionParameter("nKlength", FunctionParameter.NUMBER);
fp1.setName("%K Length");
fp1.setLowerLimit(1);
fp1.setDefault(14);
var fp2 = new FunctionParameter("nKsmoothing", FunctionParameter.NUMBER);
fp2.setName("%K Smoothing");
fp2.setLowerLimit(1);
fp2.setDefault(1);
var fp3 = new FunctionParameter("nDlength", FunctionParameter.NUMBER);
fp3.setName("%D Length");
fp3.setLowerLimit(1);
fp3.setDefault(15);
var fp4 = new FunctionParameter("nDsmoothing", FunctionParameter.NUMBER);
fp4.setName("%D Smoothing");
fp4.setLowerLimit(1);
fp4.setDefault(15);
var fp5 = new FunctionParameter("cK", FunctionParameter.COLOR);
fp5.setName("%K Color");
fp5.setDefault(Color.blue);
var fp6 = new FunctionParameter("cD", FunctionParameter.COLOR);
fp6.setName("%D Color");
fp6.setDefault(Color.red);
var fp7 = new FunctionParameter("cDslow", FunctionParameter.COLOR);
fp7.setName("%D Slow Color");
fp7.setDefault(Color.brown);
var fp8 = new FunctionParameter("bKdisplay", FunctionParameter.STRING);
fp8.setName("Display %K");
fp8.addOption("ON");
fp8.addOption("OFF");
fp8.setDefault("OFF");
}

var study = null;
var vDsmoothing = null;
var vDslow = null;

function main(nKlength, nKsmoothing, nDlength, nDsmoothing, cK, cD, cDslow, bKdisplay) {
if (study == null) {
if (nDsmoothing == null) {
vDsmoothing = 15;
} else {
vDsmoothing = Math.abs(nDsmoothing);
}
study = new StochStudy(nKlength, nKsmoothing, nDlength);
setDefaultBarFgColor(cK, 0);
setDefaultBarFgColor(cD, 1);
setDefaultBarFgColor(cDslow, 2);
}

var vK = study.getValue(StochStudy.FAST);
if (vK == null) return;
var vD = study.getValue(StochStudy.SLOW);
if (vD == null) return;

var aD = study.getValue(StochStudy.SLOW, 0, -vDsmoothing);
if (aD == null) return;

var dSum = 0;
for (i = 0; i < vDsmoothing; ++i) {
dSum += aD[i];
}
vDslow = (dSum/vDsmoothing);

if (vDslow.getValue(0) >= vDslow.getValue(-1))

{
setBarFgColor(Color.red,2);
}
else
{
setBarFgColor(Color.green,2);
}


if (bKdisplay == "OFF") vK = vK.toFixed(4);

return new Array(vK,vD,vDslow);
}