sub highlight_days {
    my ($cal) = @_;
    
    $cal->showdatenumbers(0);
    for (1..32) { # this works!  months will still display with
                  # the correct number of days.
        my $content = $cal->getcontent($_);
        
        my $size = $content ? "120%" : "90%";
        $cal->setcontent($_, qq[
            <b style="font-size:$size;float:right">$_</b>
            <span style="float:left">$content</span>
        ]);
    }
    
    return $cal;
}