Switching Between Custom Image Header and JQuery Slider

I’m in the process of building my first theme. I have done some coding to include Nivo Slider using featured images in posts.

The question I have is how can I give users the option to switch between add_custom_image_header and nivo slider?

Right now both are displaying on my site, and I want users to have the ability to use one or the other.

Here’s my index.php file.

<div id="slider">
<?php
$tmp = $wp_query;
$wp_query = new WP_Query('posts_per_page=5&category_name=featured');
if(have_posts()) :
    while(have_posts()) :
        the_post();
?>
            <a href="<?php the_permalink(); ?>" title="<?php the_title(); ?>">
		<?php the_post_thumbnail('nivothumb'); ?>
<?php
    endwhile;
endif;
$wp_query = $tmp;
?>
</div><!-- close #slider -->
<?php
// Check if this is a post or page, if it has a thumbnail, and if it's a big one
if ( is_singular() &&
has_post_thumbnail( $post->ID ) &&
( /* $src, $width, $height */ $image = wp_get_attachment_image_src( get_post_thumbnail_id( $post->ID ), 'post-thumbnail') ) &&
$image[1] >= HEADER_IMAGE_WIDTH ) :
// We have a new header image!
echo get_the_post_thumbnail( $post->ID, 'post-thumbnail' );
else : ?>
<img src="<?php header_image(); ?>" width="<?php echo HEADER_IMAGE_WIDTH; ?>" height="<?php echo HEADER_IMAGE_HEIGHT; ?>" alt="" />
<?php endif; ?>

Thanks for any help,

Dustin