Praktekum QUEUE pada JavaScript

$html>
$head>
$title>Queue$/title>
$script language="JavaScript">

var queue = new Array();

function Masuk_Antrian(data){
queue.unshift(data);
}

function Keluar_Antrian(){
var yang_keluar_antrian = queue.pop();
if(queue.length==0)
return "Antrian Sudah Kosong";
else
return yang_keluar_antrian;
}

function Dalam_Antrian(list){
list.options.length = 0;
for(var i= 0; i$ queue.length; i++){
var data = new Option(queue[i]);
list.options[list.options.length] = data;
}
}
$/script>
$/head>

$body>
$form>
$input type=text name=textSimpan>
$input type=button value="Masuk Antrian"
onClick='Masuk_Antrian(textSimpan.value);
textSimpan.value="";
Dalam_Antrian(Visualisasi);'>

$select name="Visualisasi" size=12>
$option>Isi Antrian....
$/select>
$input type=text name=textAmbil size=20>
$input type=button value="Keluar Antrian"
onClick="textAmbil.value=Keluar_Antrian();
Dalam_Antrian(Visualisasi);">
$/form>
$/body>
$/html>