No widgets showing in my sidebar

I’m not able to see any widgets that i put in my sidebar. Here is the code I’m using.

Sidebar.php

<div id="sidebar">
	<?php // if ( !function_exists('dynamic_sidebar') || !dynamic_sidebar('Sidebar') ) : ?>
    <?php // endif; ?>
</div>

Functions.php

<?php
if ( function_exists('register_sidebar') )
    register_sidebar(array(
         'before_widget' => '',
         'after_widget' => '',
         'before_title' => '<div class="subpages"><h3>',
         'after_title' => '</h3</div>',
     ));
?>