functions.php

<?php
    define( 'TEMPPATH', get_bloginfo('stylesheet_directory') );
    define( 'IMG', TEMPPATH. "/img/" );
    define( 'CSS', TEMPPATH. "/css/" );
    define( 'JS', TEMPPATH. "/js/" );

    add_theme_support('nav-menus');

    if ( function_exists('register_nav_menus') ) {

        register_nav_menus(
            array(
                'main' => 'Main Nav'

            )

        );

    }

    if ( function_exists( 'register_sidebar'  )  ) {

        register_sidebar( array (
            'name' => __( 'Primary Sidebar', 'primary-sidebar'  ),
            'id' => 'primary-widget-area',
            'description' => __( 'The primary widget area', 'dir'  ),
            'before_widget' => '<div class="widget">',
            'after_widget' => "</div>",
            'before_title' => '<h3 class="widget-title">',
            'after_title' => '</h3>',

        )  );

    }
?>