Something

<div class="sidenav">

<?php if ( !function_exists('dynamic_sidebar')
        || !dynamic_sidebar() ) : ?>

<?php if (function_exists('wp_theme_switcher')) { ?>

<h2>Themes</h2>

<?php wp_theme_switcher('dropdown'); ?>

<?php } ?>
			<?php

$today = current_time('mysql', 1);

if ( $recentposts = $wpdb->get_results("SELECT ID, post_title FROM $wpdb->posts WHERE post_status = 'publish' AND post_date_gmt < '$today' ORDER BY post_date DESC LIMIT 10")):

?>

<h2><?php _e("Recent Posts"); ?></h2>

<ul>

<?php

foreach ($recentposts as $post) {

if ($post->post_title == '')

$post->post_title = sprintf(__('Post #%s'), $post->ID);

echo "<li><a href='".get_permalink($post->ID)."'>";

the_title();

echo '</a></li>';

}

?>

</ul>

<?php endif; ?>


		<h2>Categorias</h2>

		<ul>

		<?php wp_list_cats('sort_column=name&hierarchical=0'); ?>

		</ul>

		<?php if ( is_home() ) { ?>

		<h2><?php _e('Links'); ?></h2>

		<ul>

		<?php get_links(-1, '<li>', '</li>', '', FALSE, 'name', FALSE, FALSE, -1, FALSE); ?>

		</ul>

		<?php } ?>

		<h2><?php _e('Arquivo:'); ?></h2>

		<ul>

		<?php wp_get_archives('type=monthly'); ?>
		</ul>

                <h2>Publicidade</h2>
<div align="center">
<?php adsensem_ad(); ?>
</div>
		<!--<h2><?php _e('Pesquisar:'); ?></h2>

		<form method="get" id="searchform" action="<?php echo $_SERVER['PHP_SELF']; ?>">

		<input type="text" value="<?php echo wp_specialchars($s, 1); ?>" name="s" id="s" /><input type="submit" id="sidebarsubmit" value="Pesquisar" />

		</form>-->

		<!--<li><a href="<?php bloginfo('comments_rss2_url'); ?>" title="<?php _e('The latest comments to all posts in RSS'); ?>"><?php _e('Comments <abbr title="Really Simple Syndication">RSS</abbr>'); ?></a></li>-->

		<?php wp_meta(); ?>

		</ul>
		</div>

	
<?php endif; ?>		
	
	<div class="clearer"></div>