ช่วยแก้ chainselect ให้หน่อยนะครับ แบบใช้ข้อมูลใน DATABASE อะครับ

<select id="mark">
  <option value="">--</option>
  <option value="bmw">BMW</option>
  <option value="audi">Audi</option>
</select>
<select id="series">
  <option value="">--</option>
  <option value="series-3" class="bmw">3 series</option>
  <option value="series-5" class="bmw">5 series</option>
  <option value="series-6" class="bmw">6 series</option>
  <option value="a3" class="audi">A3</option>
  <option value="a4" class="audi">A4</option>
  <option value="a5" class="audi">A5</option>
</select>

<meta charset ='utf-8'>
<script src="lib/jquery-1.7.2.js" type="text/javascript" charset="utf-8"></script>
<script src="lib/jquery.chained.js" type="text/javascript" charset="utf-8"></script>

<script src="lib/jquery.chained.js" type="text/javascript" charset="utf-8"></script><script type="text/javascript" charset="utf-8">

$(function(){
$("#major").chained("#faculty"); 
});
</script>
<?php
     $link = mysql_connect('localhost', 'root', 'root');
     if (!$link) {
	 die('Could not connect: ' . mysql_error());
	 }
	$db_selected = mysql_select_db('chain', $link);
	if (!$db_selected) {
	die ('Can\'t use foo : ' . mysql_error());
	}mysql_set_charset('utf8',$link);
	$sql_1 ="select * from faculty ";
	$sql_2 ="select * from major";
	$fac=mysql_query($sql_1);
	$moj=mysql_query($sql_2);
?>
 <label>FUCULTY</label>
        <select  id="faculty" name = "faculty" >
                <option>------</option>
                            <?
                        while ($row = mysql_fetch_array($fac)) {                                        
                ?>
					<option value='<?=$row['faculty_id']?> '> <?=$row['faculty']?>  </option>
                <?
                }
                ?>
        </select>

<label>MAJOR</label>
        <select  id="major" name = "major">
                <option>------</option>
                            <?
                        while ($row = mysql_fetch_array($moj)) {
                ?>
                  <option value='<?=$row['major_id']?> '  class ='<?=$row['faculty_id']?> '> <?=$row['major']?>  </option>

                <?
                }
                ?>
        </select>