use strict;

my %menu;
my @array = (
    'Main//Reviews//PC',
    'Other Menu//Other//Sub//Menus',
    'Main//News',
    'Main//Reviews//PS2',
    'Main//Reviews//XBox',
);

for (@array) {
   $_ =~ s/^/\$menu{'/;
   $_ =~ s/\/\//'}->{'/g;
   $_ =~ s/$/'}/;

   eval "$_ = 1";
}

list_em(\%menu);

sub list_em {
   my $ref = shift;
   if (ref($ref) eq 'HASH') {
      print "<ul>\n";
      for (keys %$ref) {
         print "<li>$_</li>\n";
         list_em($ref->{$_});
      }
      print "</ul>\n";
   }
}