ช่วยหน่อยครับผม ผมติดปัญหาการ insert data ลง database อะครับ

<?
		
			$sql = "SELECT * FROM Product WHERE ID_Category = '1' ORDER BY ID_Product ASC";
			$query = mysql_query($sql)or die("Can't Query");

		?>
		
    <div class="category-description std">
	<h1>รายการสินค้า</h1>
	<form name="myform" id="myform" method="POST" action="addorder.php">
			<?
				$i = 1;
				while($objquery = mysql_fetch_array($query)){
					$id_product = $objquery["ID_Product"];
					$product = $objquery["Product_Name"];
					$detail = $objquery["Detail"];
					$price = $objquery["Price"];
					$img = $objquery["Picture"];
			?>	
				
				<div class="product">
					<img src="images/product/<?=$img;?>" class="imgs" />
					<div class="idpro">รหัสสินค้า : <?=$id_product;?></div>
					<div class="namepro">ชื่อสินค้า : <?=$product;?></div>
					<div class="desc"><?=$detail;?> <br /> ราคา <?=$price;?> บาท</div>
					<? if($_SESSION["name"] != ""){ ?>
					<div class="buypro"><input type="text" name="quantity" class="tb4" /> &nbsp;&nbsp;
					<input type="hidden" name="idp" value="<?=$id_product;?>" />
					<input type="submit" name="buy" value="Buy" />
					</div>
					<? } ?>
				</div>
			<?
				$i++;
				}

			?>
	</form>

</div>

<?session_start();

$ids = $_SESSION["ID"];
$date = date("Y-m-d");
$idp = $_POST["idp"];
$num = $_POST["quantity"];

include("connect.php");

$sql2 = "SELECT * FROM Orders WHERE ID_Login = '$ids' ORDER BY ID_Orders DESC";
$query2 = mysql_query($sql2)or die("Can't query 2");
$objquery2 = mysql_fetch_array($query2);
$status = $objquery2["Status_pay"];

if($status != 'waiting'){

$sql = "INSERT INTO Orders (ID_Login , Sum , Date , Status_pay) VALUES ('$ids' , '0' , '$date' , 'waiting')";
$query = mysql_query($sql)or die("Can't Query");

}

$sql3 = "SELECT * FROM Orders WHERE ID_Login = '$ids' ORDER BY ID_Orders DESC";
$query3 = mysql_query($sql3)or die("Can't query 3");
$objquery3 = mysql_fetch_array($query3);
$idorders = $objquery3["ID_Orders"];
$status = $objquery3["Status_pay"];
$sum = $objquery3["Sum"];

$sql4 = "SELECT * FROM Product WHERE ID_Product = '$idp'";
$query4 = mysql_query($sql4)or die("Can't Query 4");
$objquery4 = mysql_fetch_array($query4);

$product = $objquery4["Product_Name"];
$detail = $objquery4["Detail"];
$price = $objquery4["Price"];
$picture = $objquery4["Picture"];

$total = $sum + ($price * $num);
$totaldetail = $price * $num;

$sql5 = "INSERT INTO Orderdetail (ID_Product , Date , Num , Total , ID_Orders) VALUES ('$idp' , '$date' , '$num' , '$totaldetail' , '$idorders')";
$query5 = mysql_query($sql5)or die("Can't Query 5");

echo "<script language = 'javascript'>
		alert('Add Order Complete !!');
		window.location.href='showorder.php';
	</script>";

?>