my @menubar = ( . . . );
my $template = HTML::Template->new(
        filename => 'menubar.tmpl');

$template->param(MENUBAR => [
        map {{
                title  => $_->{title},
                width  => $_->{width},
                height => $_->{height},
                param  => $_->{param},
                alt    => $_->{alt}, 
        }} @menubar
]);
# Or maybe just:
#$template->param(MENUBAR => \@menubar);
print $template->output();