merge lists

function mergethelists() {
var list1 = document.getElementById("list1")
var list2 = document.getElementById("list2")
var lista1 = list1.innerHTML.split("*r*")
var lista2 = list2.innerHTML.split("*r*")
var newlist = document.getElementById("newlist")
var new = []
for (var i = 0; i < lista2.length; i = i + 1) {
var smbl = lista2[i]
var ison = isiton(smbl,lista1)
if (ison === "no") {new.push(smbl)}}
newlist.innerHTML = new.join('*r*')
list1.innerHTML = list1.innerHTML + "*r*" + newlist.innerHTML}

function isiton(symbol,lista) {
for (var i = 0; i < lista.length; i = i + 1) {
if (getsymbol(lista[i]) === symbol) {return "yes"}}
return "no"}

function getsymbol(record) {
return record.split(*n*)[0]}

function getnote(record) {
var recorda = record.split(*n*)
if (recorda.length === 0) {return ""}
else {return recorda[1]}}