function preMain(){
    setPriceStudy(true);
    setStudyTitle("Forum Series Example")
}

var xCloseMinusUBB = null;	// Global variable
var xCloseMinusLBB = null;	// Global variable
var xHighestClose = null;	// Global variable

function main(){
    if(getBarState() == BARSTATE_ALLBARS){
        var nCalcUBB = null;
        var nCalcLBB = null;
        var nHighestClose = null;
        xCloseMinusUBB = efsInternal("CalcCloseMinusUBB")                               // No function parameters
        xCloseMinusLBB = efsInternal("CalcCloseMinusLBB", close(), lowerBB(20, 2));	// Pass 2 function parameters
        xHighestClose = highest(10, close());                                           // Use eSignal's series objects.
    }
    nCalcUBB = xCloseMinusUBB.getValue(0);
    nCalcLBB = xCloseMinusLBB.getValue(-3);
    nHighestClose = xHighestClose.getValue(-5);

    if(getBarState() != BARSTATE_CURRENTBAR)
        debugPrintln(getCurrentBarIndex() + "\t" + close(0) + "\t" + upperBB(20, 2, 0) + "\t" + 
                    lowerBB(20, 2, 0) + "\t" + nCalcUBB + "\t" + nCalcLBB + "\t" + nHighestClose);
    return;
}
    
function CalcCloseMinusUBB(){
    return close(0) - upperBB(20, 2, 0)
}

function CalcCloseMinusLBB(nPrice, nLBB){
    return nPrice.getValue(0) - nLBB.getValue(0);
}