Drupal: add JS (Javascript) only on Frontpage via template.php function hook

Drupal: Add JS (Javascript) only to Frontpage via template.php function hook

function YOURTHEMENAME_preprocess_page(&$vars, $hook)
{
    // jQuery - diese Scripte fuer alle Seiten einbinden
    drupal_add_js(drupal_get_path('theme', 'YOURTHEMENAME') . '/js/sidewide.js', array('scope' => 'footer', 'weight' => 80));
    // jQuery - diese Scripte nur auf Startseite einbinden

    if ($vars['is_front']) {
      drupal_add_js(drupal_get_path('theme', 'YOURTHEMENAME') . '/js/plugin.js');
      drupal_add_js(drupal_get_path('theme', 'YOURTHEMENAME') . '/js/script.js', array('scope' => 'footer', 'weight' => 99));
    }
}