Edited Header.php

<div id="site-description"><?php bloginfo( 'description' ); ?></div>
		<?php if( !is_page_template( 'PopUp' ):?>
				<?php
					// Check if this is a post or page, if it has a thumbnail, and if it's a big one
					if ( is_singular() && current_theme_supports( 'post-thumbnails' ) &&
							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 );
					elseif ( get_header_image() ) : ?>
						<img src="<?php header_image(); ?>" width="<?php echo HEADER_IMAGE_WIDTH; ?>" height="<?php echo HEADER_IMAGE_HEIGHT; ?>" alt="" />
					<?php endif; ?>
		<?php endif;?>
			</div><!-- #branding -->