Is this possible?

[foolishtrader]

Is it possible to alter this efs function to set the trailing stops based on the open and close values instead of the high and low values?

/***********************************************
Provided By:
eSignal (Copyright c eSignal), a division of Interactive Data
Corporation. 2009. All rights reserved. This sample eSignal
Formula Script (EFS) is for educational purposes only and may be
modified and saved under a new file name. eSignal is not responsible
for the functionality once modified. eSignal reserves the right
to modify and overwrite this EFS file with each new release.


Description:
Average True Range Trailing Stops, by Sylvain Vervoort


Version: 1.0 04/09/2009


Formula Parameters: Default:
ATR Period 5
ATR Multiplication 3.5
Long or Short Long
Show Line Trailing Stop True
Show Labels True
Show Arrows True
Display Cursor Labels True
Line Color Red


Notes:
The related article is copyrighted material. If you are not a subscriber
of Stocks & Commodities, please visit www.traders.com.


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


var fpArray = new Array();


function preMain() {
setPriceStudy(true);
setStudyTitle("ATR Trailing Stops");
setCursorLabelName("ATR Trailing Stop", 0);
setShowTitleParameters(false);
setDefaultBarFgColor(Color.red, 0);
setPlotType(PLOTTYPE_LINE, 0);
setDefaultBarThickness(2, 0);


askForInput();
var x=0;
fpArray[x] = new FunctionParameter("nATRPeriod", FunctionParameter.NUMBER);
with(fpArray[x++]){
setName("ATR Period");
setLowerLimit(1);
setUpperLimit(100);
setDefault(1);
}
fpArray[x] = new FunctionParameter("nATRMultip", FunctionParameter.NUMBER);
with(fpArray[x++]){
setName("ATR Multiplication");
setLowerLimit(1);
setUpperLimit(10);
setDefault(1);
}
fpArray[x] = new FunctionParameter("bShowTS", FunctionParameter.BOOLEAN);
with(fpArray[x++]){
setName("Show Line Trailing Stop");
addOption("true");
addOption("false");
setDefault("true");
}
fpArray[x] = new FunctionParameter("bShowL", FunctionParameter.BOOLEAN);
with(fpArray[x++]){
setName("Show Labels");
addOption("true");
addOption("false");
setDefault("true");
}
fpArray[x] = new FunctionParameter("bShowArrows", FunctionParameter.BOOLEAN);
with(fpArray[x++]){
setName("Show Arrows");
addOption("true");
addOption("false");
setDefault("true");
}
fpArray[x] = new FunctionParameter("ViewValue", FunctionParameter.BOOLEAN);
with(fpArray[x++]){
setName("Display Cursor Labels");
setDefault(true);
}
fpArray[x] = new FunctionParameter("sStrategy", FunctionParameter.STRING);
with(fpArray[x++]){
setName("Long or Short");
addOption("Long");
addOption("Short");
setDefault("Long");
}
fpArray[x] = new FunctionParameter("cColor", FunctionParameter.COLOR);
with(fpArray[x++]){
setName("Line Color");
setDefault(Color.red);
}
}


var bInit = false;
var bVersion = null;
var xATRTrailingStop = null;
var xClose = null;


function main(nATRPeriod, nATRMultip, sStrategy, bShowTS, bShowL, bShowArrows, ViewValue, cColor){
var nClose = 0;
var nClose1 = 0;
var nATRTS = 0;
var nATRTS1 = 0;


if (bVersion == null) bVersion = verify();
if (bVersion == false) return;


if(bInit==false){
setShowCursorLabel(ViewValue);
setDefaultBarFgColor(cColor, 0);
xClose = close();
xATRTrailingStop = efsInternal("ATRTrailingStop", nATRPeriod, nATRMultip, xClose);
bInit=true;
}


if(getCurrentBarIndex() == 1) return;

nClose = xClose.getValue(0);
nClose1 = xClose.getValue(-1);
nATRTS = xATRTrailingStop.getValue(0);
nATRTS1 = xATRTrailingStop.getValue(-1);
if (nATRTS1 == null) return;


if (nClose1 < nATRTS1 && nClose > nATRTS1) {
if (bShowArrows) drawShape( Shape.UPARROW, BelowBar1, Color.green);
if (sStrategy == "Long") {
if (bShowL) drawTextRelative(0, BelowBar2, " LONG", Color.white, Color.green, Text.PRESET|Text.CENTER|Text.FRAME, "Arial Black", 10, "b"+(getCurrentBarCount()), -5);
Strategy.doLong("Long", Strategy.MARKET, Strategy.NEXTBAR);
} else {
if (bShowL) drawTextRelative(0, BelowBar2, " EXIT", Color.white, Color.green, Text.PRESET|Text.CENTER|Text.FRAME, "Arial Black", 10, "b"+(getCurrentBarCount()), -5);
if (Strategy.isShort()) Strategy.doCover("Exit Short", Strategy.MARKET, Strategy.NEXTBAR);
}
}
if (nClose1 > nATRTS1 && nClose < nATRTS1) {
if (bShowArrows) drawShape( Shape.DOWNARROW, AboveBar1, Color.red);
if (sStrategy == "Long") {
if (bShowL) drawTextRelative(0, AboveBar2, " EXIT", Color.white, Color.red, Text.PRESET|Text.CENTER|Text.FRAME, "Arial Black", 10, "b"+(getCurrentBarCount()), -5);
if (Strategy.isLong()) Strategy.doSell("Exit Long", Strategy.MARKET, Strategy.NEXTBAR);
} else {
if (bShowL) drawTextRelative(0, AboveBar2, "SHORT", Color.white, Color.red, Text.PRESET|Text.CENTER|Text.FRAME , "Arial Black", 10, "b"+(getCurrentBarCount()), -5);
Strategy.doShort("Short", Strategy.MARKET, Strategy.NEXTBAR);
}
}


if (bShowTS == false) return;
return xATRTrailingStop.getValue(0);
}


var xATR = null;
var nRef = 0;
var bSecondInit = false;


function ATRTrailingStop(nATRPeriod, nATRMultip, xSClose){
var nClose = 0;
var nClose1 = 0;
var nLoss = 0;
var nRes = 0;
var nRef = ref(-1);


if (bSecondInit == false) {
xATR = atr(nATRPeriod);
bSecondInit = true;
}
nClose = xSClose.getValue(0);
nClose1 = xSClose.getValue(-1);
nLoss = nATRMultip * xATR.getValue(0);
if (nLoss == null || nClose1 == null) return;

if (nClose > nRef && nClose1 > nRef) {
nRes = Math.max(nRef, nClose - nLoss);
} else {
if (nClose < nRef && nClose1 < nRef) {
nRes = Math.min(nRef, nClose + nLoss);
} else {
if (nClose > nRef) {
nRes = nClose - nLoss;
} else {
nRes = nClose + nLoss;
}
}
}
return nRes;
}

function verify() {
var b = false;
if (getBuildNumber() < 779) {
drawTextAbsolute(5, 35, "This study requires version 8.0 or later.",
Color.white, Color.blue, Text.RELATIVETOBOTTOM|Text.RELATIVETOLEFT|Text.BOL D|Text.LEFT,
null, 13, "error");
drawTextAbsolute(5, 20, "Click HERE to upgrade.@URL=http://www.esignal.com/download/default.asp",
Color.white, Color.blue, Text.RELATIVETOBOTTOM|Text.RELATIVETOLEFT|Text.BOL D|Text.LEFT,
null, 13, "upgrade");
return b;
} else {
b = true;

}
return b;
}