javascript sucks ass

<html>
    <head>
    </head>
    <body>
    <form id="F1" name="F1" method="post" action="">
        <select name="Z" id="Z">
            <option>---Select Zone---</option>
            <option value="U">United States</option>
            <option value="O">Oceania</option>
            <option value="L">Latin America</option>
            <option value="E">Europe</option>
            <option value="C">China</option>
            <option value="K">Korea</option>
            <option value="T">Taiwan</option>
        </select>
        <select name="relm" id="relm">
            <option selected="selected">---Select Relm---</option>
<?php
$db = mysql_connect('localhost', 'root', 'pass');
mysql_select_db ('DATABASE', $db);

$Z = $_POST['Z'];
$sel = "SELECT * FROM Realm WHERE Zone = '$Z'";
$result = mysql_query($sel);
while($row = mysql_fetch_assoc($result)) {
        echo '<option value='$row['RealmID']'>'$row['RealmName']'</option>';
?>
        </select>
    </body>
</html>