funcao selected

<?php

$conect = mysql_connect($host,$user,$senha) or die ("deu merda!!!");
$ok = mysql_select_db("controleexterno",$conect);






    $query ="SELECT * FROM ins_sabores order by sabor";
    $query_comparacao = "SELECT * FROM ins_inscricao_sabores where id_inscricao='40'";

   $result = mysql_query($query);
   $result2 = mysql_query($query_comparacao);
   while ($row=mysql_fetch_array($result, MYSQL_ASSOC))
   {
            $id_drop_sabor = $row['id_sabor'];
            $sabor = $row['sabor'];

                $selected = 1;


                while($row2 = mysql_fetch_array($result2, MYSQL_ASSOC))
                {
                    $id_inscricao = $row2['id_inscricao'];
                    $id_sabor = $row2['id_sabor'];

                    if($id_drop_sabor==$id_sabor)
                    {
                        $form_sabor_sorvete.="<option selected='selected' value='$id_drop_sabor'>$sabor</option>";
                        $selected==0;
                    }

                }

                if($selected==1)
                    {
                        $form_sabor_sorvete.="<option value='$id_drop_sabor'>$sabor</option>";
                    }




   }
?>
<form action="" method="get">
<?php




print "<select multiple='multiple' size='12' >";
print $form_sabor_sorvete  ;
print "</select>";
?>
<input type="submit" />
</form>