add_action('plugins_loaded', 'stp_pop_init');

    if (!function_exists('stp_pop_init')){
        function stp_pop_init() {
            add_action('init', 'stp_pop_setup', 9999);

            wp_register_style(
                'stp_bootstrap_theme_css',
                plugins_url( '/assets/css/bootstrap-theme.css', __FILE__ ),
                false,
                false,
                false
            );
            wp_register_style(
                'stp_bootstrap_css',
                plugins_url( '/assets/css/bootstrap.css', __FILE__ ),
                false,
                false,
                false
            );
            wp_register_script(
                'stp_bootstrap_js',
                plugins_url( '/assets/js/bootstrap.js', __FILE__ ),
                array ('jquery'),
                false,
                false
            );
        }
	}