var myBottomInset = 4; 
var myJedeNteZeile = 5; 
var myUeberspringen = 0; 
 
if (app.selection.length == 1) { 
	var txt1 = app.selection[0]; 
	if (txt1.constructor.name == "TextFrame") { 
		if (txt1.tables.count() == 1) { 
			var tbl1 = txt1.tables.firstItem(); 
			 
			for (var i=myUeberspringen; i<tbl1.rows.count(); i++) { 
				erg1 = (i-myUeberspringen) % myJedeNteZeile; 
				 
				if (erg1 == 0) { 
					row1 = tbl1.rows.item (i); 
					row1.bottomInset = myBottomInset; 
				} 
			} 
		} 
	} 
}