ขอถามเรื่องส่ง GET URL หน่อย จะถามว่า จะส่งค่ายังไง ให้มีข้อมูลเลข 2 อยู่ตลอด แต่เปลี่ยนเฉพาะข้อมูลส่วนที่เป็นเลข 3

<?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"; ?>
 <? if($_GET['action']!='id_brand'){?>
      <img src="images/product.jpg" border="0"/><br />
      <ul class="showInColumn_product" border="0">
	<?
    $sql="SELECT * FROM tb_products_detail WHERE id_brand=$_GET[brand_id]";
    $q=mysql_query($sql)or die (mysql_error());
    while($rec=mysql_fetch_assoc($q)){
    ?>
       <li style="margin:1px; padding:2px;">
       <span><a href="<?=$_SERVER['PHP_SELF']?>?action=id_brand&ids=<?=$rec['id']?>"><img src="uploads/products_detail/<?=$rec["images"];?>"/></a>
       <div style="float:left;"><a href="download/<?=$rec["download_file"];?>"><img src="images/ic_pdf.gif" /></a></div>
	   <div style="text-align:right;"><a href="<?=$_SERVER['PHP_SELF']?>?action=id_brand&ids=<?=$rec['id']?>"><?=$rec["title"];?></a></div></span>
	   </li>
    <?
    }//while
    ?>
      </ul> <!--showInColumn_product -->
<?
}//if
?>
<?
if($_GET['action']=='id_brand'){?>
<ul class="showInColumn_product" border="0">
<img src="images/product.jpg" border="0"/><br />
	<?
	//$sql="SELECT * FROM `tb_products_detail` WHERE `id_brand`='".$_GET['id_brand']."' AND `id`='".$_GET['ids']."'";	
	$sql="SELECT * FROM `tb_products_detail` WHERE `id_brand`='".$_GET['ids']."' ";	
    $q=mysql_query($sql)or die (mysql_error());
    while($rec=mysql_fetch_assoc($q)){
    ?>
  <li style="margin:1px; padding:2px;">
  <span><a href="<?=$_SERVER['PHP_SELF']?>?action=id_brand&ids=<?=$rec['id']?>"><img src="uploads/products_detail/<?=$rec["images"];?>"/></a>
  <div style="float:left;"><a href="download/<?=$rec["download_file"];?>"><img src="images/ic_pdf.gif" /></a></div>
  <div style="text-align:right;"><a href="<?=$_SERVER['PHP_SELF']?>?action=id_brand&ids=<?=$rec['id']?>"><?=$rec["title"];?></a></div></span>
<?
}//while
//echo $sql;
?>
</ul><!--showInColumn_product -->
      <img src="images/switch_plug.jpg" /> 
<ul class="showInColumn_product_detail">
      <li style="background:#99FF00; text-align:center; "><span>Product Code</span></li>
      <li style="background:#99FF00; text-align:center; width:250px;"><span>Description</span></li>
      <li style="background:#99FF00; text-align:center; width:150px;"><span>Brand</span></li>
      <li style="background:#99FF00; text-align:center; width:50px;"><span>Price</span></li>
      <li style="background:#99FF00; text-align:center; width:95px;"><span>Discount</span></li>
<?
//$sql_detail="SELECT * FROM `tb_products_details` WHERE `id_brand`='".$_GET['brand_id']."' AND `id`='".$_GET['ids']."'";	
//gen page
$page=(isset($_GET['page']))? intval($_GET['page']) : 1; 
$limit_end=25; 
$limit_start=($page-1)*$limit_end;  
$send =""; 

if(isset($_GET["brand_id"]) and $_GET["brand_id"] !="")
{ 
$send = "brand_id=".$_GET["brand_id"]; 
$condition= "WHERE `id_brand`= '".$_GET["ids"] ."'"; 
//$ands="AND `id`='".$_GET['ids']."'";
} 
$sqlcommand="SELECT * FROM `tb_products_details`".$condition."ORDER BY id DESC";
$result =mysql_query($sqlcommand." LIMIT ".$limit_start.",".$limit_end,$conn); 
$count = mysql_num_rows($result); 
$total = mysql_num_rows(mysql_query($sqlcommand,$conn)); 

if($total > 0)
{
    while($recs=mysql_fetch_assoc($result)){
    ?>
      <li><span><?=$recs['product_code']?></span></li>
      <li style="width:250px;"><span><?=$recs['description']?></span></li>
      <li style="width:150px; text-align:center;"><span><?=$recs['brand']?></span></li>
      <li style="width:50px;"><span><?=$recs['price']?></span></li>
      <li style="width:95px;"><span><?=$recs['discount']?></span></li>
    <?
    }//while
	//echo $sqlcommand;
    ?>
    <div style="float:left;"><span>Page : <?=page_navi($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>
    <?
	}//if
	?>
<?
}//if
?>
</ul> <!--showInColumn_product_detail -->
  </div>
   </div>
</div>
<!--Left -->
<? require_once"leftmenu.php";?>
<!--footer -->
<? require_once"footer.php";?>
</div><!--maincontainer -->
</body>
</html>