[shuron]

poprobuj wmesto
$tireqty = $HTTP_POST_VARS['tireqty'];
$oilqty = $HTTP_POST_VARS['oilqty'];
$sparkqty = $HTTP_POST_VARS['sparkqty'];

napisat...

$tireqty = $_POST['tireqty'];
$oilqty = $_POST_['oilqty'];
$sparkqty = $_POST['sparkqty'];