Editing 'if home page' in functions.php renders blank screen – Skeleton Theme

I’m in the middle of editing my functions.php file because I want to add in a custom slider on the home page. But after my edit, I’m getting a blank screen when I refresh site on my browser.

I should also mention that I’m using the Skeleton theme for my site.

I suppose it’s obvious that I haven’t written the code correctly, but I don’t know where to pin point where.

/*-----------------------------------------------------------------------------------*/
// Content Wrap Markup - skeleton_content_wrap()
// Be sure to add the excess of 16 to skeleton_before_sidebar() as well
/*-----------------------------------------------------------------------------------*/

if ( !function_exists( 'skeleton_content_wrap' ) )  {

	function skeleton_content_wrap() {

	$columns = '';
	$columns = apply_filters('skeleton_set_colwidth', $columns, 1);
	$latest_blog_posts = new WP Query( array ( 'posts_per_page'  => 1 ) );

	echo '<a id="top"></a>';
	if ( is_front_page() ) {
		if($latest_blog_posts->have_posts()) {

	echo "<div class=\"home-slider\">";
	echo "<div class=\"homepage-slider\">";
		echo '<img src="'.get_site_url.'/wp-content/uploads/2015/02/slider01.jpg">';
		echo '<img src="'.get_site_url.'/wp-content/uploads/2015/02/slider02.jpg">'; 

	while ($latest_blog_posts->have_posts()) {
		$latest_blog_posts->the_post();

	echo "<div class=\"image\">";
		echo "<div class=\"slide\">";

				echo "<div class=\"slide_image\">";
					echo the_post_thumbnail();
				echo "</div>";
				echo "<div class=\"slide_title\">";
					echo the_title();
				echo "</div>";
			echo "</a>";
	echo "</div>";

	endwhile;
		}
	}
	}

	echo "</div>";
	echo "</div>";
	echo "</div>";
	echo "</div>";
	} else {
	/*echo '<h1 class="entry-title">';*/
/*	echo the_title();*/
	/*echo '</h1>';*/
	}
	echo "<div id=\"wrap\" class=\"container\">";
	echo '<div class="entry-content">';
	echo '<div id="content" class="'.$columns.' columns">';
	}
	add_action( 'skeleton_before_content', 'skeleton_content_wrap', 1 );
}

I’d appreciate the help.