Both calls don't work. But maybe that's because I've changed a few minor things in the sidebar code. This is the code I'm currently using:
<? // LEFT SIDEBAR ?><div id="leftsidebar">
<?php if ( function_exists('dynamic_sidebar') && dynamic_sidebar(1) ) : else : ?>
<?php $my_query = new WP_Query('cat=1,2&showposts=4'); ?>
<?php while ($my_query->have_posts()) : $my_query->the_post(); ?>
<div class="post">
<h2 id="post-<?php the_ID(); ?>"> " rel="bookmark" title="Link naar <?php the_title(); ?>"><?php the_title(); ?></h2>
<?php the_content_rss('meer...', FALSE, 'more_file', 12); ?>
<small >⊆<?php the_time('d m Y') ?></small>
</div><?php endwhile; ?>
<?php /* If this is the frontpage */ if ( is_home() || is_page() ) { ?> <?php } ?>
<?php endif; ?></div><? // END LEFT SIDEBAR ?>
<? // RIGHT SIDEBAR ?><div id="rightsidebar">
<?php if ( function_exists('dynamic_sidebar') && dynamic_sidebar(2) ) : else : ?>
<h2>Zoek</h2>
<?php include (TEMPLATEPATH . '/searchform.php'); ?>
<h2>Agenda</h2>
<?php wp_dday_list(); ?>
<?php st_tag_cloud(); ?>
<?php /* If this is the frontpage */ if ( is_home() || is_page() ) { ?><?php } ?>
<?php endif; ?></div><? // END RIGHT SIDEBAR ?>