WordPress tabs shortcode

pilau-tabs.css

/*
 * This is the bare minimum CSS necessary to make jQuery UI tabs "work".
 * Obviously you'll need to do a lot more styling to make them "good" :)
 */
.ui-tabs-hide { display: none; }

pilau-tabs.js

jQuery( document ).ready( function( $ ) {
	
	// Initialize tabs
	if ( $( '.pilau-tabs' ).length )
		$( '.pilau-tabs' ).tabs();

});

pilau-tabs.php

<?php

// This code can be dropped into a theme's functions.php, or - with the right headers - made into a little plugin

/**
 * Tabs
 *
 * The [tab] shortcode should be placed at the top of each section of content meant
 * to be placed in a tab. Use the label attributes for the tab label, e.g.
 * [tab label="Features"].
 *
 * The shortcode function itself creates the panes for the tabbed content, and leaves
 * a placeholder for the tabs list. The tab labels are gathered into a global array,
 * which is then used by a filter on the_content, which constructs the actual tabs
 * list, and replaces the placeholder with it.
 *
 * @uses	$pilau_tabs
 * @uses	wp_enqueue_script()
 * @uses	shortcode_atts()
 * @uses	pilau_tabs_id()
 * @uses	esc_html()
 * @return	string
 */
add_shortcode( 'tab', 'pilau_tab' );
function pilau_tab( $atts ) {
	global $pilau_tabs;
	$output = '';

	// Enqueue jQuery UI tabs
	wp_enqueue_script( 'jquery-ui-tabs' );

	// Get attributes
	extract( shortcode_atts( array( "label" => __( 'Tab' ) ), $atts ) );

	if ( empty( $pilau_tabs ) ) {

		// First tab - initialize
		$pilau_tabs = array();
		$output = '<div class="pilau-tabs">' . "\n" . '#pilau_tabs#' . "\n" . '<section class="content" id="' . pilau_tabs_id( $label ) . '"><div class="post-content">' . "\n";

	} else {

		// Close a pane, open a pane
		$output .= '</div></section>' . "\n" . '<section class="content" id="' . pilau_tabs_id( $label ) . '"><div class="post-content">' . "\n";

	}

	// No-JS fallback sub-headings
	$output .= '<h2 class="hide-if-js">' . esc_html( $label ) . '</h2>' . "\n";

	// Add label to array
	$pilau_tabs[] = $label;

	return $output;
}

/**
 * Filter content to place tabs list
 *
 * @uses	$pilau_tabs
 * @uses	pilau_tabs_id()
 * @uses	esc_html()
 * @param	string	$content
 * @return	string
 */
add_filter( 'the_content', 'pilau_tabs_content', 1000 );
function pilau_tabs_content( $content ) {
	global $pilau_tabs;

	if ( count( $pilau_tabs ) ) {

		// Construct the tabs list
		$tabs_list = '';
		foreach ( $pilau_tabs as $tab ) {
			$tabs_list .= '<li><a href="#' . pilau_tabs_id( $tab ) . '">' . esc_html( $tab ) . '</a></li>' . "\n";
		}

		// Put the list in - hidden if no JS
		$content = str_replace( '#pilau_tabs#', '<ul class="tabs hide-if-no-js">' . "\n" . $tabs_list . '</ul>', $content );

		// Close the last pane, and the overall tabs wrapper
		$content .= '</section>' . "\n" . '</div>';
	}

	// Reset tabs
	$pilau_tabs = array();

	return $content;
}

/**
 * Helper function to create IDs for tabs
 *
 * @uses	sanitize_title_with_dashes()
 * @param	string	$label
 * @param	string	$prefix
 * @return	string
 */
function pilau_tabs_id( $label, $prefix = 'tab-' ) {
	return sanitize_title_with_dashes( $prefix . $label );
}

Steve, this is doing almost exactly what I need, but I'm wondering what it would take to extend it to allow for subtabs... I know jquery ui allows for it, could your code be prevailed upon to do the same?