php รบกวนพี่ๆ ช่วยดู code ให้ด้วยครับ ผมจะทำตัด stock แต่มันไม่ได้ครับ

<?
session_start();
$cid=$_GET[c_id];
include"connect.php";
$sqls="select * from order_detail where Orders_id='$cid'";
mysql_query('SET NAME tis620');
$results=mysql_db_query($dbname,$sqls);
$r=mysql_fetch_array($results);
$pid=$r[Pro_id];
$am=$r[Amount];

$sqlU="Update products set Total=Total-$am where Pro_id='$pid'";
$result=mysql_db_query($dbname,$sql);
if ($result) {
	echo "<H3> Product Type Add Sucessful</H3>";
	echo "[ <A HREF=basket_user.php>Go To Last Page</A> ] ";
} else {
	echo "<H3>ERROR : Please revised Type</H3>";
}
mysql_close();
?>