if(isset($_POST['submited'])) {
        $nome = $_POST['nome'];
        $preco = $_POST['preco'];
        $descricao = $_POST['descricao'];
        $marca = $_POST['marca'];
        $sabor = $_POST['sabor'];

        $idmarca = "SELECT IDMARCA as idmarca
                FROM `nutrinow`.`marcas`
                WHERE `MARCA` = $marca";

        $idsabor = "SELECT `IDSABOR` as idsabor
                FROM `nutrinow`.`sabores`
                WHERE `SABOR` =".$_POST['sabor'];


        $txtquery = "INSERT INTO `nutrinow`.`produtos` (`IDPRODUTO`, `IDMARCA`, `IDSABOR`, `NOME`, `PRECO`, `DESCRICAO`, `MARCA`, `SABOR`)" .
                    "values ('', '$idmarca', '$idsabor', '$nome', '$preco', $descricao, '$marca', $sabor)";


        mysql_query($txtquery);

}