Can you please change the visit_site_link function so it takes 2 parameters like this: visit_site_link('some title','data for a tag');  As an example, we'd like to use something like visit_site_link('Visit Site','class="external"'); and that would produce <a class="external" href="xxx">...  I know we could do simple styling by putting the function within a span, but this would also allow us to pass in javascript etc.

Thanks for considering this.

Since the plugin is not encrypted you can edit the code as you wish to add your own features. But here's an updated version of the function for you:

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function visit_site_link($text = 'Visit This Site', $html = null, $custom_id = null) {
    global $id, $wpdb;
    $pid = $id;
    if (is_numeric($custom_id))
        $pid = $custom_id;

    $result = $wpdb->get_results("SELECT url FROM " . $wpdb->visitlinks . " WHERE post_id = " . $pid);

    if (count($result) > 0 && $result[0]->url != "http://") {
        echo '<a href="' . $result[0]->url . '"';
        if (!empty($html)) echo ' ' . $html . ' ';
        echo '>' . $text . '</a>';
    }

}