/* Save the meta box's post metadata. */
function kk_save_location_map( $post_id, $post ) {

    /* Verify the nonce before proceeding. */
    if ( !isset( $_POST['location_map_nonce'] ) || !wp_verify_nonce( $_POST['location_map_nonce'], basename( __FILE__ ) ) )
        return $post_id;

    /* Get the post type object. */
    $post_type = get_post_type_object( $post->post_type );

    /* Check if the current user has permission to edit the post. */
    if ( !current_user_can( $post_type->cap->edit_post, $post_id ) )
        return $post_id;

    /* Get the posted data and sanitize it for use as an HTML class. */
    $new_meta_value = ( isset( $_POST['location-map'] ) ? ( $_POST['location-map'] ) : '' );

    /* Get the meta key. */
    $meta_key = 'location-map';

    /* Get the meta value of the custom field key. */
    $meta_value = esc_textarea(get_post_meta( $post_id, $meta_key, true ));

    /* If a new meta value was added and there was no previous value, add it. */
    if ( $new_meta_value && '' == $meta_value )
        add_post_meta( $post_id, $meta_key, $new_meta_value, true );

    /* If the new meta value does not match the old value, update it. */
    elseif ( $new_meta_value && $new_meta_value != $meta_value )
        update_post_meta( $post_id, $meta_key, $new_meta_value );

    /* If there is no new meta value but an old value exists, delete it. */
    elseif ( '' == $new_meta_value && $meta_value )
        delete_post_meta( $post_id, $meta_key, $meta_value );
}