IF/Else Banner Slider Switching

Hi Everyone,

Left to my own devices I have not been able to successfully get this working. I want to find a way to switch between the native WordPress Header and a Nivo Content Slider.

(So if no Header is selected the default displays the Nivo Content Slider or vice versa.)

It was suggested that I wrap everything in IF/Else, but I’m not too good with PHP. I’m lost. Here’s my code.

<div id="branding" role="banner">
				<?php $heading_tag = ( is_home() || is_front_page() ) ? 'h1' : 'div'; ?>
				<<?php echo $heading_tag; ?> id="site-title">
					<span>
						<a href="<?php echo home_url( '/' ); ?>" title="<?php echo esc_attr( get_bloginfo( 'name', 'display' ) ); ?>" rel="home"><?php bloginfo( 'name' ); ?></a>
					</span>
				</<?php echo $heading_tag; ?>>
				<div id="site-description"><?php bloginfo( 'description' ); ?></div>

<?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 ) :
						// Houston, 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; ?>

<div id="slider">
<?php
$tmp = $wp_query;
$args = array(
	'post_type' => 'page',
	'post__in'  => array( '16' )
);
$wp_query = new WP_Query( $args );
if(have_posts()) :
    while(have_posts()) :
        the_post();
?>
            <a href="<?php the_permalink(); ?>"><?php the_post_thumbnail('nivothumb'); ?></a>
<?php
endwhile;
endif;
$wp_query = $tmp;
?>
</div>
			</div><!-- #branding -->

I’m using the Twentyten theme and right now both items are displaying.

Thanks for any help,

Dustin