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change updateproduct.php file to:

<?php
include("db.php");
$proid=$_POST['ITEM'];
$itemnumber=$_POST['itemnumber'];
//mysql_query("UPDATE inventory SET qtyleft='$itemnumber'
//WHERE id='$proid'");

$result = mysql_query("SELECT * FROM inventory
WHERE id='$proid'") or die(mysql_error());

$row = mysql_fetch_array( $result );

$count = $row['qtyleft'] + $itemnumber;

$result = mysql_query("UPDATE inventory SET qtyleft='$count' WHERE id='$proid'")
or die(mysql_error());

header("location: tableedit.php#page=addproitem");
?>

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