Wordpress (Tabbed Navigation).php

/* Add to header.php */

<script type="text/javascript" src="<?php bloginfo("template_url"); ?>/js/sidebar_tabs.js"></script>	 												
/* Stored in inc or includes folder as tab-nav.php */

	<div id="organic-tabs">
					
    		<ul id="tab-nav">
                <li id="ex-tab1"><a rel="tab1" href="#" class="current">Featured</a></li>
                <li id="ex-tab2"><a rel="tab2" href="#">Categories</a></li>
                <li id="ex-tab3"><a rel="tab3" href="#">Bookmarks</a></li>
                <li id="ex-tab4" class="last"><a rel="tab4" href="#">Meta</a></li>
            </ul>
            
    		<div class="clear"></div>
    		
    		<div id="all-list-wrap">
    		
    			<ul id="tab1">
					<?php echo popularPosts(10); ?>    			
				</ul>
        		 
        		 <ul id="tab2">
                    <?php wp_list_categories('orderby=name'); ?>
        		 </ul>
        		 
        		 <ul id="tab3">
					<?php wp_list_bookmarks(); ?>
        		 </ul>
        		 
        		 <ul id="tab4">
		    		<?php wp_register(); ?>
		    		<li><?php wp_loginout(); ?></li>
		    		<li><a href="http://wordpress.org/" title="Powered by WordPress, state-of-the-art semantic personal publishing platform.">WordPress</a></li>
		    		<?php wp_meta(); ?>
        		 </ul>
        		 
    		 </div> <!-- END List Wrap -->
		 
		 </div> <!-- END Organic Tabs -->
		 
		 
/* Add to fuctions.php */

// Popular posts function
function popularPosts($num) {
    global $wpdb;

    $posts = $wpdb->get_results("SELECT comment_count, ID, post_title FROM $wpdb->posts ORDER BY comment_count DESC LIMIT 0 , $num");

    foreach ($posts as $post) {
        setup_postdata($post);
        $id = $post->ID;
        $title = $post->post_title;
        $count = $post->comment_count;

        if ($count != 0) {
            $popular .= '<li>';
            $popular .= '<a href="' . get_permalink($id) . '" title="' . $title . '">' . $title . '</a> ';
            $popular .= '</li>';
        }
    }
    return $popular;
}
		 
		 
/* Add to CSS */////////////////////
		 
ul { list-style: none; }
#all-list-wrap ul li a { display: block; border-bottom: 1px solid #666; padding: 4px; color: #666; }
#all-list-wrap ul li a:hover { background: #fe4902; color: white; }
#all-list-wrap ul li:last-child a { border: none; }

#all-list-wrap ul li ul li { border-bottom: 1px solid #666; }
#all-list-wrap ul li ul li:last-child { border: none; }

#organic-tabs { background: #eee; padding: 10px; margin: 0 0 15px 0; -moz-box-shadow: 0 0 5px #666; -webkit-box-shadow: 0 0 5px #666; }

#tab-nav { overflow: hidden; margin: 0 0 10px 0; }
#tab-nav li { width: 65px; float: left; margin: 0 0 0 0; }
#tab-nav li.last { margin-right: 0; }
#tab-nav li a { display: block; padding: 5px; background: #959290; color: white; font-size: 10px; text-align: center; border: 0; }
#tab-nav li a:hover { background-color: #111; }

#tab3, #tab2, #tab4 { display: none; }

#tab-nav li#ex-tab1 a.current, ul#tab1 li a:hover { background-color: #0575f4; color: white; }
#tab-nav li#ex-tab2 a.current, ul#tab2 li a:hover { background-color: #d30000; color: white; }
#tab-nav li#ex-tab3 a.current, ul#tab3 li a:hover { background-color: #8d01b0; color: white; }
#tab-nav li#ex-tab4 a.current, ul#tab4 li a:hover { background-color: #FE4902; color: white; }