public function addItem($id, $site, $price, $quantity, $condition,
   $sellerName, $sellerRating, $sellerLocation, $description, $link){

   $q = "INSERT INTO tbl_items VALUES(
      '$id',
      '$site',
      $price,
      $quantity,
      '$condition',
      '$sellerName',
      $sellerRating,
     '$sellerLocation',
     '$description',
     '$link',
     ".time().")";

  return mysql_query($q, $this->connection);
}

addItem("id1", "site1", 100, NULL, "NULL", "NULL", "NULL", "NULL", "NULL", "NULL",);