รบกวนสอบถามการดึงค่าลง dropdown โดยใช้ javascipt (dropdown 2 อันเชื่อมกัน)

<?php include('config.php'); ?>
<?php include('header.php'); ?>

<script language = "JavaScript">

				function ListDorm(SelectValue)
				{						

					<?
						$intRows = 0;
						$host = "localhost";
						$user = "gznwyiib_kku";
						$passwd = "aroundkhonkean";
						$dbname = "gznwyiib_kku";
	
						mysql_connect($host,$user,$passwd) or die("ติดต่อฐานข้อมูลไม่ได้");
						mysql_select_db($dbname) or die("ติดต่อฐานข้อมูลไม่ได้");
						$sql = "select * from dorminatory";
						mysql_query("SET NAMES UTF8");
						$sqlquery = mysql_db_query($dbname,$sql);
						$intRows = 0;
						while($array = mysql_fetch_array($sqlquery))
							{
								$intRows++;
					?>
			
								x = <?= $intRows;?>;
								mySubList = new Array();
				
								strGroup = <? echo $array['Idzone']; ?>;
								strValue = <? echo $array['Iddorm']; ?>;
								strItem = "<? echo $array['NamedormTH']; ?>";
																																
								mySubList[x,0] = strItem;
								mySubList[x,1] = strGroup;
								mySubList[x,2] = strValue;
								
					if(mySubList[x,1] == SelectValue)
					{
						var opt = document.createElement("option");
																														
						document.getElementById("ddlDorm").options.add(opt);
						
						opt.value = mySubList[x,2];											
						opt.text = mySubList[x,0];
						
					}
					<?
						}						
					?>
				}
				//** จบการดึงข้อมูลหอพัก **//
	
			</script>

			<div>
				<ul class="breadcrumb">
					<li>
						<a href="index.php">หน้าหลัก</a> <span class="divider">/</span>
					</li>
                    <li>
						<a href="managedorm.php">ข้อมูลห้องพัก</a> <span class="divider">/</span>
					</li>
					<li>
						<a href="#">เพิ่มข้อมูลห้องพัก</a>
					</li>
				</ul>
			</div>
            
            <div class="row-fluid sortable">
				<div class="box span12">
					<div class="box-header well" data-original-title>
						<h2><i class="icon-edit"></i> ข้อมูลห้องพัก</h2>
						<div class="box-icon">
							<a href="#" class="btn btn-setting btn-round"><i class="icon-cog"></i></a>
							<a href="#" class="btn btn-minimize btn-round"><i class="icon-chevron-up"></i></a>
							<a href="#" class="btn btn-close btn-round"><i class="icon-remove"></i></a>
						</div>
					</div>
					<div class="box-content">
						<form action="" name="frmAdd" method="post" enctype="multipart/form-data" class="form-horizontal">
						  <fieldset>
							<legend>กรุณากรอกรายละเอียดให้ครบ</legend>
							
                            	<div class="control-group">
								<label class="control-label" >โซนหอพัก</label>
								<div class="controls">
								  <select id="ddlZoneDorm" name="ddlZoneDorm" data-rel="chosen" onChange="ListDorm(this.value)">
                                  <option selected value=""></option>
                                  	<?
						  				$sql = "select * from zonedorm";
										mysql_query("SET NAMES UTF8");
										$sqlquery = mysql_db_query($dbname,$sql);
										while($array = mysql_fetch_array($sqlquery))
										{
									?>
										<option value="<?= $array['Idzone'];?>"><?= $array['Namezone'];?></option>
								  	   
                                    <? }
									
						    		?>
                                    
                                    </select>
								</div>
							</div>
                              
                          	<div class="control-group">
								<label class="control-label" >หอพัก</label>
								<div class="controls">
								  <select id="ddlDorm" name="ddlDorm" data-rel="chosen"></select>
								</div>
							  </div>
                              
                            <div class="control-group">
								<label class="control-label">ชื่อห้องพัก</label>
								<div class="controls">
								  <input type="text" name="txtnameroom">
								</div>
							</div>                 
                                                        
                            <div class="control-group">
								<label class="control-label">รายละเอียดโดยย่อ</label>
								<div class="controls">
								  <input type="text" name="txtdetaildorm" class="span6">
								</div>
							</div>
                            
                            <div class="control-group">
							  <label class="control-label" for="textarea2">เนื้อหาทั้งหมด</label>
							  <div class="controls">
								<textarea class="cleditor" name="txtcontentdorm" id="textarea2" rows="3"></textarea>
							  </div>
							</div>
                            
                            <div class="control-group">
							  <label class="control-label" for="fileInput">ภาพประกอบ</label>
							  <div class="controls">
								<input class="input-file uniform_on" name="imgupload" id="fileInput" type="file">
							  </div>
							</div>
                              
                              <div class="form-actions">
							  <button type="submit" name="submit" value="submit" class="btn btn-primary">บันทึก</button>
							  <button type="reset" class="btn">ยกเลิก</button>
                              <input type="hidden" name="MM_insert" value="form1" />
							</div>
                              
						  </fieldset>
						</form>   

					</div>
				</div><!--/span-->
                
                <?
					mysql_close();
				?>

			</div>
            
<?php include('footer.php'); ?>