ใช้ php แล้วทำการแบ่งหน้าแสดงผลไม่ได้ครับ ช่วยหน่อยนะครับ

<?
session_start();
if ($sess_adminid<>session_id()) { 
	header( "Location: admin.php"); exit(); 
}
include "connect.php";
$sql="select * from tb_product order by id_prd desc";
$result=mysql_db_query($dbname,$sql);
$number=mysql_num_rows($result);
?>
<? 
	echo "
		<TABLE BORDER=1>
		<TR BGCOLOR=#FFCC66> 
			<TD><CENTER>รหัส</CENTER></TD>
			<TD><CENTER>ชื่อ</CENTER></TD>
			<TD><CENTER>รุ่น</CENTER></TD>
			<TD><CENTER>ประเภท</CENTER></TD>
			<TD><CENTER>ราคา</CENTER></TD>
			<TD><CENTER>จำนวนที่มี</CENTER></TD>
			<TD><CENTER>แก้ไข</CENTER></TD>
			<TD><CENTER>ลบ</CENTER></TD>
		</TR> ";
				$sql = "select * from tb_product";
				$rs = mysql_query($sql);
				$totalrow = mysql_num_rows($rs); 
				
				$pagesize = 10;  // แสดงจำนวน
				$totalpage = (int)($totalrow/$pagesize); 
				if(($totalrow%$pagesize)!=0){
				$totalpage += 1;
				} 
				// หา record แรกที่จะแสดงของแต่ละหน้า
				if(isset($page)){
				$pageno = $page;
				$start = $pagesize*($pageno-1);
				}else{
				$pageno = 1;
				$start = 0;
				}
	$sql="select * from tb_product limit $start,$pagesize";
	while($rs=mysql_fetch_array($result)) {
		$id_prd=$rs[id_prd];
		$code_prd=sprintf("%05d",$id_prd);
		$name_prd=$rs[name_prd];
		$ref_id_cat=$rs[ref_id_cat];
		$ref_id_type=$rs[ref_id_type];
		$price_prd=$rs[price_prd];
		$unitonstock=$rs[unitonstock];
		$photo_prd_font=$rs[photo_prd_font];
		$photo_prd_back=$rs[photo_prd_back];
		$flash_prd=$rs[flash_prd];

		$sql2="select class_cat from tb_categories where id_cat='$ref_id_cat' ";
		$result2=mysql_db_query($dbname,$sql2);
		$rs2=mysql_fetch_array($result2);

		$class_cat=$rs2[class_cat];
		
		$sql2="select name_type  from tb_type where id_type='$ref_id_type' ";
		$result2=mysql_db_query($dbname,$sql2);
		$rs2=mysql_fetch_array($result2);

		$name_type=$rs2[name_type];
		
		echo "
			<TR> 
			<TD><CENTER>$code_prd</CENTER></TD>
			<TD>$name_prd</TD>
			<TD>$class_cat</TD>
			<TD>$name_type</TD>
			<TD><CENTER>$price_prd</CENTER></TD>
			<TD><CENTER>$unitonstock</CENTER></TD>
			<TD><A HREF=\"admin_product_edit.php?id_edit=$id_prd\">แก้ไข</A></TD>
			<TD><A HREF=\"admin_product_delete.php?id_del=$id_prd&photo_del=$photo_prd\" 
				onclick=\"return confirm('ยืนยันลบประเภท $name_prd ออกจากระบบ')\">ลบ</A></TD>
			</TR>
		</TR>";
	}
	echo "</TABLE>";	
	mysql_close();
?>
              
<?
if($pageno >1){
echo " <b class='text'><a href='?page=",$pageno-1,"'>Previous</a></b> |";
} 
for($i=1;$i<=$totalpage;$i++){
if($pageno==$i){
echo" <b class='text'>".$i."</b> |";
}else{
echo "<b class='text'> <a href='?page=$i'>$i</a> </b>|";
}
}
if($pageno<$totalpage){
echo "<b class='text'> <a href='?page=",$pageno+1,"'>Next</a></b>";
}
?>