Here's fragments of something I did along these lines:

for ( 1..$MAXNUM)
{
    my $out_key = radio_group(-name=>"key$_", -value=>\@in_keys, -rows
+=>1, -default=>0);
    $out_key =~ s!<td>!<td>Choose Key:</td><td>!i;
    $out_key =~ s!</td>!</td>\n!gi;

    
    my $out_scale = 'Scale/Chord type: ' . popup_menu(-name=>"scale$_"
+, -value=>\@in_scales, -length=>scalar(@in_scales) + 3, -default=>'ma
+jor,');

    for ($out_key, $out_scale) { s/<TABLE/<TABLE border='1'/i; print; 
+}
}

# later #

if ( param() )
{
    # stuff    
        for ( 1..$MAXNUM )
        {
            if (  param("key$_") and param("scale$_") ) 
            {
                push @cmd, "-s", param("key$_") ."," . param("scale$_"
+);
            }
        }
    # other stuff
}
[download]

This runs under strict, too.

This can be seen in action at http://bob-n.com/cgi-bin/chord.pl, downloaded in full at: http://bob-n.com/comp/scripts/index.html

--Bob Niederman, http://bob-n.com

All code given here is UNTESTED unless otherwise stated.