parentStory.paragraphs.previousItem(myParagraph); 

function previousPara( onePara ) 
{ 
	var myParaIndex = onePara.parentStory.insertionPoints.itemByRange( 0, onePara.index + 1 ).paragraphs.length; 
	var prePara = onePara.parentStory.paragraphs[myParaIndex - 2]; 
	return prePara; 
} 
 
function nextPara( onePara ) 
{ 
	var myParaIndex = onePara.parentStory.insertionPoints.itemByRange( 0, onePara.index + 1 ).paragraphs.length; 
	var nePara = onePara.parentStory.paragraphs[myParaIndex]; 
	return nePara; 
} 

main(); 
 
function main() { 
	var a = app.documents[0].stories[0].paragraphs[0].index; 
	var aStory = app.activeDocument.stories[0]; 
	var d1 = new Date(); 
	var arrayA = loadByPrevious(aStory); 
	var d2 = new Date(); 
	alert("Fill by previous in Sekunden: " + compareDates(d1,d2)); 
 
	var d1 = new Date(); 
	var arrayA = loadByOwn(aStory); 
	var d2 = new Date(); 
	alert("Fill by own in Sekunden: " + compareDates(d1,d2)); 
 
	var d1 = new Date(); 
	var arrayA = loadByIndex(aStory); 
	var d2 = new Date(); 
	alert("Fill by index in Sekunden: " + compareDates(d1,d2)); 
 
	 
} 
 
function loadByPrevious(aStory) { 
	var lastPar = aStory.paragraphs.lastItem(); 
	var pIndexs = new Array(); 
	var i = lastPar.index; 
	var pPar = aStory.paragraphs.previousItem(lastPar); 
	pIndexs.push(i); 
	while ( i > 0) { 
		i = pPar.index; 
		pIndexs.push(i); 
		pPar = aStory.paragraphs.previousItem(pPar); 
	} 
	return pIndexs; 
} 
 
function loadByOwn(aStory) { 
	var lastPar = aStory.paragraphs.lastItem(); 
	var pIndexs = new Array(); 
	var i = lastPar.index; 
	pIndexs.push(i); 
	var nPar = getPNumber(aStory, i); 
	var pPar = aStory.paragraphs[nPar-1]; 
	while ( i > 0) { 
		i = pPar.index; 
		pIndexs.push(i); 
		nPar = getPNumber(aStory, i); 
		pPar = aStory.paragraphs[nPar-1]; 
	}	 
	return pIndexs; 
} 
 
function loadByIndex(aStory) { 
	var lastPar = aStory.paragraphs.lastItem(); 
	var pIndexs = new Array(); 
	var i = lastPar.index; 
	pIndexs.push(i); 
	var nPar = getPNumber(aStory, i); 
	var pPar = aStory.paragraphs[nPar-1]; 
	while ( i > 0) { 
		i = pPar.index; 
		pIndexs.push(i); 
		nPar--; 
		pPar = aStory.paragraphs[nPar]; 
	}	 
	return pIndexs; 
} 
 
function getPNumber(aStory, anIndex) { 
	if (anIndex == 0) { 
		return 0; 
	} else { 
		nPars = aStory.paragraphs.length; 
		for (var n=1 ; n < nPars; n++) { 
			if (aStory.paragraphs[n].index >= anIndex) { 
				return n; 
			} 
		} 
	} 
	return -1; 
} 
 
function compareDates(d1, d2) { 
	// Gibt den Unterschied zwischen zwei Dates in Sekunden 
	var m1 = (d1.getHours() * 60 * 60000) + (d1.getMinutes()*60000) + (d1.getSeconds() * 1000) + d1.getMilliseconds(); 
	var m2 = (d2.getHours() * 60 * 60000) + (d2.getMinutes()*60000) + (d2.getSeconds() * 1000) + d2.getMilliseconds(); 
	return (m2 - m1) / 1000; 
} 

var t1 = zeitPunkt(); 
// do something 
zeitStop(); 
 
 
function zeitPunkt()  
{ 
	var d = new Date() 
	return Math.round( d.getTime() / 100 ) 
} 
 
function zeitStop()  
{ 
	var t2 = zeitPunkt(); 
	var myTime =( t2 - t1 ) / 10; 
	if ( myTime >= 60 ) { 
		myMin = Math.floor( myTime / 60 ); 
		mySec = myTime-myMin * 60; 
		myTime = myMin + ':' + mySec + ' Min.'; 
	} 
	else  
	{ 
		myTime += ' Sek.' 
	} 
	alert( 'Fertig!\rnach ' + myTime );	 
}