// simpleBilling.jsx   
  
var MWST = 16/100;  
if (app.selection[0].parent.constructor.name == "Cell"){   
	var myTable = app.selection[0].parent.parent;   
	var myLastCol = myTable.columns.length-1;   
	var myLastRow = myTable.rows.length-1;   
	var mySum = 0;   
	for (k = 0; k < myLastRow-2; k++) {   
		 mySum += (myTable.columns[myLastCol].cells[k].contents.replace(",", "."))*1   
	}   
	myTable.columns[myLastCol].cells[myLastRow-2].contents  = digitFormatter(mySum);   
	myTable.columns[myLastCol].cells[myLastRow-1].contents  = digitFormatter(mySum*MWST);   
	myTable.columns[myLastCol].cells[myLastRow].contents  = digitFormatter(mySum*MWST + mySum);   
}  
 
function digitFormatter(x) {  
	// Quelle: http://www.dcljs.de/faq/antwort.php?Antwort=rechnen_runden#6  
	var k = (Math.round(x * 100) / 100).toString();  
	k += (k.indexOf('.') == -1)? '.00' : '00';  
	var p = k.indexOf('.');  
	return k.substring(0, p) + ',' + k.substring(p+1, p+3);  
}