dynamic sidebar not displaying…

for some reason I cannot get the dynamic sidebar to display

I added the following code at the top of my sidebar, right after the first

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

and then
added

    <?php endif; ?>

right after this chunk of content in the sidebar:

<li><!-- Theme switcher -->
			<h2><?php _e('Themes'); ?></h2>

				<?php wp_theme_switcher(); ?>
		</li>
<!-- End of Theme switcher -->

		<?php } ?>

I also added functions.php which has this in it:

<?php
if ( function_exists('register_sidebar') )
    register_sidebar();
?>

So when my site loads the dynamic sidebar does not display at all and the footer does not display either…

any ideas?