เอ่อ...จะสร้าง addcart แบบไม่ต้องสมัครสมาชิกจะทำอย่างไรคะ

<?include('cdate.php');
    include("system/include/class_main.inc"); 
    include("system/include/functionWeb.php");
	session_start();

	if(trim($_SESSION['id_member']) == "")
	{	$db3 = new admin_control();
		$sql = "select * from tb_member  ";

		$db3->send_cmd($sql);
		$norder = $db3->num_rows();

		if($norder==0)
		$norder = 1;
		if($norder<=30)
		$norder = 31;
		else
		$norder = $norder+1;
		$id_member = $norder;
			  
		$db4 = new admin_control();
		$sql = "insert into tb_membe r(id_member,namesur,addr) values('$id_member','General','NoAddress') ";
         	                $db4->send_cmd($sql);
		$_SESSION['id_member'] = $id_member;
		echo "<meta http-equiv=\"refresh\" content=\"0; \">";				  
	}
	else
	{
	include('cdate.php');
	include("system/include/class_main.inc"); 
	include("system/include/functionWeb.php");
	$db1 = new admin_control();

	$id_pro = trim($_GET['id_pro']);
	$id_type = trim($_GET['id_type']);
	$size_pro = trim($_GET['size_pro']);
	$color_pro = trim($_GET['color_pro']);
	$qty = trim($_GET['qty']);

	if(($_GET['flag']=="del") && (trim($_GET['id_pro'])!=""))
	{
	          $sql = "delete from tb_cart where id_pro = '$id_pro' and id_member='$_SESSION[id_member]'";
	          $db1->send_cmd($sql);
	}

	if(isset($_POST['SubmitCal']))
	{
	                $proid = $_POST['proid'];
		$qty = $_POST['qty'];
		for($i=0;$i<count($proid);$i++)
		{
		    $tmp = $qty[$i];
		    $tmp1 = $proid[$i];
		    $sql = "update tb_cart set
		    qtyc =  $tmp where 
		    id_member = '$_SESSION[id_member]'and id_pro = '$tmp1'  ";
		    $db1->send_cmd($sql);
		}
	}

	if((trim($_GET['id_pro'])!="") && (trim($_GET['id_type'])!="") && (trim($_GET['qty'])!=""))
	{
		$sql = "select * from tb_cart where id_member = '$_SESSION[id_member]' and id_pro='$id_pro' and size_pro = '$size_pro' and color_pro='$color_pro' ";
		$db1->send_cmd($sql);
		if($db1->num_rows() > 0)
		{
		      $sql = "update tb_cart set  qtyc = qtyc + $qty 
                                                  where id_member = '$_SESSION[id_member]'
			  and id_pro = '$id_pro' and size_pro='$size_pro' 
                                                  and color_pro='$color_pro' ";
			  $db1->send_cmd($sql);
		}
		else
		{
			$dbc = new admin_control();
			$sqlc = "select * from tb_product where id_pro = '$id_pro'";
			$dbc->send_cmd($sqlc);
			$rsc = $dbc->fetch_data();
			$deli = $rsc['deli_pro'];
			$sql = "insert into tb_cart(id_member,id_pro,qtyc,size_pro,deli_pro,color_pro) values('$_SESSION[id_member]','$id_pro','$qty','$size_pro','$deli','$color_pro')";

			$db1->send_cmd($sql);
		}
	}
?>..................................