replace icons in Social Media Feather plugin with custom icons; see http://wordpress.org/plugins/social-media-feather/

gistfile1.php

<?php

/*
* replace icons in Social Media Feather with custom icons
* @ref: http://wordpress.org/plugins/social-media-feather/
*/

add_filter('synved_social_skin_image_list', 'custom_social_feather_icons');

function custom_social_feather_icons($image_list) {

    // set up file and URI paths
    $path = dirname(__FILE__) . '/image/social';
    $baseURL = plugins_url('image/social', __FILE__);

    // get list of sizes
    $dirs = glob($path . '/*', GLOB_ONLYDIR);
    $dirs = array_map('basename', $dirs);
    $sizes = array();

    foreach ($dirs as $dirname) {
        $parts = explode('x', $dirname);

        if (!empty($parts[0])) {
            $sizes[] = (int) $parts[0];
        }
    }
    sort($sizes, SORT_NUMERIC);

    // search path for icons replacing the regular icons
    foreach (array_keys($image_list) as $site) {
        $icons = array();
        foreach ($sizes as $size) {
            $imagepath = "$path/{$size}x{$size}/$site.png";
            if (file_exists($imagepath)) {
                $icons[$size] = array (
                    'name' => "{$size}x{$size}",
                    'sub' => "/$site.png",
                    'path' => $imagepath,
                    'uri' => "$baseURL/{$size}x{$size}/$site.png",
                );
            }
        }

        if (count($icons) > 0) {
            $image_list[$site] = $icons;
        }
    }

    return $image_list;
}

I would love to use this script. What directory do I put the new icons in? does it go in the theme directory(where I added this code to the function.php file) or does it go in the content directory?