$co->submit(-name=>'edit', -value=>'edit'),
$co->submit(-name=>'preview', -value=>'preview'),

##</code><code>##

my $name=>$co->param('name');
if ($name eq 'edit'){
    $string="http://mywebserver/cgi-bin/edit.cgi";
    }
elsif($name eq 'preview'){
    $string="http://mywebserver/cgi-bin/preview.cgi";
    }

##</code><code>##

$co->start_form(-method=>'POST', -action=>"$string"),