public static function instance()
 {
     if (self::$_instance == null) {
         self::$_instance = new JBlogERM();
     }
     return self::$_instance;
 }
<?
$a = JBlogERM::instance();
wp_enqueue_style('css_erm', $a->plugin_url . 'css/bootstrap.css');
wp_enqueue_script('jquery_erm', 'http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js');
wp_enqueue_script('js-1', $a->plugin_url . 'js/bootstrap.min.js');
wp_enqueue_script('js-2', $a->plugin_url . 'js/main.js');
wp_enqueue_script('js-3', $a->plugin_url . 'js/tooltip.min.js');
wp_enqueue_script('js-4', $a->plugin_url . 'js/jquery.fancybox.pack.js');
wp_enqueue_script('js-5', $a->plugin_url . 'js/jquery.validate.min.js');
?>
<div class="container-fluid">
<div class="row">
<div id="content-wrap" class="wrap col-md-12">
<h2>Панель управления ERM</h2>

<div id="content-tab" class="bs-example bs-example-tabs">
<ul id="myTab" class="nav nav-tabs" style="border-bottom: none;">
    <li id="manager" class="active"><a href="#edit" data-toggle="tab"><span class="glyphicon glyphicon-cog"
                                                                            aria-hidden="true"></span>&nbsp;&nbsp;Управление</a>
    </li>
    <li id="adding" class=""><a href="#add" data-toggle="tab"><span class="glyphicon glyphicon-plus"
                                                                    aria-hidden="true"></span>&nbsp;&nbsp;Добавить</a>
    </li>
    <li id="infoTab" class=""><a href="#info" data-toggle="tab"><span class="glyphicon glyphicon-map-marker"
                                                                      aria-hidden="true"></span>&nbsp;&nbsp;Точный поиск
            координат на карте</a></li>
</ul>
<div style="clear: both;"></div>
<div id="myTabContent" class="tab-content">
<div class="tab-pane fade active in" id="edit">
<form action="" method="post">