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//Registers a widget named footer-widget

if ( function_exists('register_sidebar') )
register_sidebar(array('name'=>'footer-widget',
  'before_widget' => '',
  'after_widget' => '',
  'before_title' => '<h4>',
  'after_title' => '</h4>',
));

//Display ""footer-widget" in the footer

<footer>
  	<?php if ( !function_exists('dynamic_sidebar') || !dynamic_sidebar('footer-widget') ) : ?>
	<?php endif; ?>
</footer>