MY SQL Error / You have an error in your SQL syntax;

<?
$Act=$_GET['Act'];
switch($Act){
case 'Confirm'     :

$Date=date("Y-m-d");
$supplier=$_POST['supplier'];

$CountName="order";
$Date=date("Y-m-d");
$SelectCount=Select("count","WHERE countname='".$CountName."'");
$Count=mysql_fetch_array($SelectCount);
$OrderId="Order-".substr("000000".$Count['count'],-5);

$InsertOrder=Insert("order","order_id,sup_id,date_order","'".$OrderId."','".$supplier."','".$Date."'");

  for($i=0;$i<=(int)$_SESSION["intLine"];$i++)
  {
	  if($_SESSION["strProductID"][$i] != "")
	  {
			  $InsertOrderDetail=Insert("order_detail","order_id,part_id,quantity","'".$OrderId."','".$_SESSION['strPartID'][$i]."','".$_SESSION['strQty'][$i]."'");
	  }
  }

session_destroy();
	}

?>