my $hdata = <call that creates the struct>;
my ($rating, $bwurl) = 0;
foreach my $id ( keys %$hdata ) {
    if($hdata->{$id}{Season} == $seasonnum && $hdata->{$id}{Rating} > $rating){
         $rating = $hdata->{$id}{Rating};
         $bwurl  = $hdata->{$id}{BannerPath};
    }
}