ใช้ java script select ข้อมูลจาก DB มาแสดงแล้วบาง ฟิลไม่แสดงข้อมูลครับ

<script language="JavaScript">
	function resutName(id)
	{
		switch(id)
		{
			<?php
			$strSQL = "SELECT * FROM durable ORDER BY du_id ASC";
			$objQuery = mysql_query($strSQL);
			while($objResult = mysql_fetch_array($objQuery))
			{
			?>
				case "<?php echo $objResult["du_id"];?>":
				f.txtName.value = "<?php echo $objResult["du_code"];?>";
				f.txtName2.value = "<?php echo $objResult["du_brand"];?>";
				break;
			<?php
			}
			?>
			default:
			 f.txtName.value = "";
			 f.txtName2.value = "";
		}
		
	}
</script>

<select id="cpu" name="cpu" onchange="resutName(this.value)">
			<option value="">--เลือกคอมพิวเตอร์--</option>
		<?php 
		while($arr1 = mysql_fetch_array($qr1,MYSQL_ASSOC))
		{
			$sql2 = "select * from durable where du_id = '".$arr1['du_id']."' and du_status = 'c' ";
			$qr2 = mysql_query($sql2);
			$arr2 = mysql_fetch_array($qr2,MYSQL_ASSOC);
		?>
		<option value="<?php echo $arr2['du_id']; ?>"><?php echo $arr2['du_comname']; ?></option>
		<?php  } ?>
		</select>