I have a problem selecting 6 random friends

This is the query I've got so far: 

$result = num_rows("SELECT * FROM friends WHERE member_id = '".$_SESSION['userid']."'");
if($result >= 6) {
    $f_num = 6;
} else {
    $f_num = $result;
}
for($i = 1; $i <= $f_num; $i++) {
    $q_get_member_friends = mysql_query("SELECT * FROM friends WHERE member_id = '".$_SESSION['userid']."' ORDER BY rand() LIMIT 1");
    $r_get_member_friends = mysql_fetch_array($q_get_member_friends);
    echo $r_get_member_friends['friend_with'];
}

I want to select 6 random friends if the logged in user has more or equal to 6 friends

Stuck on this for a while now :/

Thanks for any help :)

php mysql
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