Plugin to hook into sidebar-footer

Hello All,

I am having trouble getting a plugin to hook into the twenty-eleven themes sidebar-footer.php which displays at the bottom of the page.

For example these are some the attempts I have made:
add_filter (‘the_content’, ‘anti_email_spam’, 100);
//add_filter (‘dynamic_sidebar’, ‘anti_email_spam’, 100);
add_filter (‘sidebars_widgets’, ‘anti_email_spam’, 100);
add_action( ‘wp_register_sidebar_widget’, ‘anti_email_spam’, 100 );
add_action( ‘wp_register_sidebar’, ‘anti_email_spam’, 100 );
//add_action(‘wp_footer’, ‘anti_email_spam’,100);
//add_action( ‘wp_register_footer_widget’, ‘anti_email_spam’, 100 );
//add_action(‘wp_footer’, ‘anti_email_spam’,100);
//add_action(‘dynamic_sidebar’, ‘anti_email_spam’,100);

None of these seem to run the function I want to run in the footer area. There is a apply_filter(‘sidebars_widgets’,) in the widgets.php file but I’m not sure if that’s the name of the hook I should use.

I was able to get it working using a hammer but there must be a more
elegant way. This is the code I’m using until I find a better solution.

if (function_exists('anti_email_spam'))
{
  ob_start();
  dynamic_sidebar( 'sidebar-3' );
  $so = ob_get_clean();
  echo anti_email_spam($so);
}
else
{
  dynamic_sidebar( 'sidebar-3' );
}

Thanks,
Craig