[Plugin: Wp Ajax Tree] Bad jQuery Loading

if(wp_script_is('jquery','registered')) {
    $ver = $wp_scripts->registered['jquery']->ver;
    wp_deregister_script('jquery');
    wp_register_script('jquery', ("http://ajax.googleapis.com/ajax/libs/jquery/$ver/jquery.min.js"), false, $ver);
    if(!is_admin()) wp_enqueue_script('jquery');
  }

should be

if(wp_script_is('jquery','registered') && !is_admin()) {
    $ver = $wp_scripts->registered['jquery']->ver;
    wp_deregister_script('jquery');
    wp_register_script('jquery', ("http://ajax.googleapis.com/ajax/libs/jquery/$ver/jquery.min.js"), false, $ver);
    wp_enqueue_script('jquery');
  }

http://ww.wp.xz.cn/extend/plugins/wp-ajax-tree/