ดูโค้ดส่วนแบ่งหน้าช่วยหน่อยค่ะ ต้องการส่งตัวแปร brand_id ไปทุกหน้าค่ะ

<?php require_once"config.inc.php";?>
<?php require_once"top.inc.php";?>
<?php require_once"function_page.php";?>
<div id="maincontainer">
<? require_once"text.top.php";?>
<!--Content -->
<div id="contentwrapper">
	<div id="contentcolumn">
	  <div class="innertube"><?php require_once"menu_content.php"; ?>
<ul class="showInColumn_product" border="0">
<img src="images/product.jpg" border="0"/><br />
	<?
//select images again
	//$sql="SELECT * FROM `tb_products_detail` WHERE `id_brand`='".$_GET['id_brand']."' AND `id`='".$_GET['ids']."'";	
	//$sql="SELECT * FROM `tb_products_detail` WHERE id_brand='".$_GET['brand_id']."' AND `id_type`='".$_GET['type_id']."'";
	$sql="SELECT * FROM `tb_products_detail` WHERE id_brand='".$_GET['brand_id']."'";// select 3 image
    $q=mysql_query($sql)or die (mysql_error());
	echo $sql;
    while($rec=mysql_fetch_assoc($q)){
    ?>
<!--image -->  
  <li style="margin:1px; padding:2px;">
  <span><a href="products_detail.php?brand_id=<?=$rec['id_brand']?>&type_id=<?=$rec['id_type']?>"><img src="uploads/products_detail/<?=$rec["images"];?>"/></a>
<!--download_file -->  
  <div style="float:left;"><a href="download/<?=$rec["download_file"];?>"><img src="images/ic_pdf.gif" /></a></div>
  <div style="text-align:right;"><a href="products_detail.php?brand_id=<?=$rec['id_brand']?>&type_id=<?=$rec['id_type']?>"><?=$rec["title"];?></a></div></span>
<?
}//while
//echo $sql;
?>
</ul><!--showInColumn_product -->
      <!--<img src="images/switch_plug.jpg" />  -->
	  <ul class="showInColumn_product_detail">
          <li style="background:#99FF00; text-align:center; "><span>Product Code</span></li>
          <li style="background:#99FF00; text-align:center; width:300px;"><span>Description</span></li>
          <li style="background:#99FF00; text-align:center; width:100px;"><span>Brand</span></li>
          <li style="background:#99FF00; text-align:center; width:50px;"><span>Price</span></li>
          <li style="background:#99FF00; text-align:center; width:95px;"><span>Discount</span></li>
<?
//gen page
//$page=(isset($_GET['page']))? intval($_GET['page']) : 1; 
$page=(isset($_GET['page']))? intval($_GET['page']."&"."brand_id=".$_GET["brand_id"]."&"."id_type=".$_GET["type_id"]) : 1 ."&"."brand_id=".$_GET["brand_id"]."&"."id_type=".$_GET["type_id"];
$limit_end=25; 
$limit_start=($page-1)*$limit_end;  
$send =""; 

if(isset($_GET["brand_id"]) and $_GET["type_id"] !="")
{ 
$send = "brand_id=".$_GET["brand_id"]."&"."id_type=".$_GET["type_id"]; 
//$send = "action=showDetail"."&"."brand_id=".$_GET["brand_id"]."&"."id_type=".$_GET["type_id"]; 

//$condition= "WHERE id_brand= '".$_GET["brand_id"] ."' AND id_type='".$_GET['type_id']."'";
//$condition= "WHERE `id_brand`= '".$_GET["brand_id"] ."'";
} 
//echo $send;
//$sqlcommand="SELECT * FROM `tb_products_details`".$condition."ORDER BY id DESC";
$sqlcommand="SELECT * FROM `tb_products_details` WHERE  id_brand= '".$_GET["brand_id"]."'  AND  id_type= '".$_GET["type_id"]."' ORDER BY id DESC";
//$sqlcommand="SELECT * FROM `tb_products_details` WHERE  id_brand= '".$_GET["brand_id"]."'  AND  id_type= '4' ORDER BY id DESC";
$result =mysql_query($sqlcommand." LIMIT ".$limit_start.",".$limit_end,$conn)or die(mysql_error());

echo $sqlcommand;
//echo  "  type_id :".$_GET['type_id'];

$count = mysql_num_rows($result); 
$total = mysql_num_rows(mysql_query($sqlcommand,$conn)); 

//echo $total;

if($total > 0)
{
    while($recs=mysql_fetch_assoc($result)){
    ?>
      <li><span><?=$recs['product_code']?></span></li>
      <li style="width:300px;"><span><?=$recs['description']?></span></li>
      <li style="width:100px; text-align:center;"><span><?=$recs['brand']?></span></li>
      <li style="width:50px;"><span><?=$recs['price']?></span></li>
      <li style="width:95px;"><span><?=$recs['discount']?></span></li>
    <?
    }//while
    ?>
    <div style="float:left;"><span>Page : <?=page_navi($page, $limit_end, 4, $total, $send)?></span></div>
	<div style="float:right; width:100px; margin-right:25px;"><span>[ <?=($limit_start+1)?>-<?=($limit_start+$count)?> ] of <strong> <?=$total?> </strong> items</span></div>
</ul> <!--showInColumn_product_detail -->
    <?
	}//if
	?>
  </div>
   </div>
</div>
<!--Left -->
<? require_once"leftmenu.php";?>
<!--footer -->
<? require_once"footer.php";?>
</div><!--maincontainer -->
</body>
</html>