if(validRows.length >= 1){
  for (var i = 0; i < validRows.length; i++) {
	var fieldno = validRows[i].replace("parentRow","");
	var txtinput = validRows[i].replace("parentRow","parentName");
	eval("input=document.registerNew." + txtinput + ".value");
	var txtcombo = validRows[i].replace("parentRow","parentTitle");
	eval("combo=document.registerNew." + txtcombo + ".value");
	if(txtinput == "" || txtcombo == "0"){
		errorstring = "yes";
	}
   }
}

if (errorstring == "yes"){
	alert("Please fill in all parent names and relationships before adding more rows");
}