Enable Sticky Post

Hello to all of you! I need some help…

My theme does not support sticky posts and I need to visualize 1 sticky post on the top of my homepage that have a magazine layout. I tried to insert this code before the loop:

<?php
/* Get all sticky posts */
$sticky = get_option( 'sticky_posts' );
$args = array(
	'posts_per_page' => 1,
	'post__in'  => get_option( 'sticky_posts' ),
	'ignore_sticky_posts' => 1
);
query_posts( $args );

/* Sort the stickies with the newest ones at the top */
rsort( $sticky );

/* Get the 5 newest stickies (change 5 for a different number) */
$sticky = array_slice( $sticky, 0, 1 );

/* Query sticky posts */
query_posts( array( 'post__in' => $sticky, 'caller_get_posts' => 1 ) );
?>

It works fine if I have selected at last 1 sticky post, but if I have not, my layout become a mess… How can I fix it the best way?
This is the code of the part of my index I want change:

<div id="featwrapper">
<div id="feat">
<div id="featbig">
		<div class="featbig">
<?php query_posts('showposts=1&cat='.get_option('mainnewscat').'&offset=0'); if (have_posts()) : ?><?php while (have_posts()) : the_post(); ?>
            	<h2 style="min-height:58px;"><a href="<?php the_permalink() ?>" rel="bookmark"><?php the_title(); ?></a></h2>
              <?php if(get_option('thumbok')!="no"):?>  <?php if( has_post_thumbnail() ) { ?>
            <a href="<?php the_permalink(); ?>"><?php the_post_thumbnail('featbigimg'); ?></a>
             <?php } else { ?>
           <a href="<?php the_permalink(); ?>">  <img src="<?php bloginfo('template_directory'); ?>/images/noimg.png" style="width:418px; height:215px;" /> </a><?php } ?>
           <?php endif?> 

           <?php if(get_option('thumbok')!="yes"):?>
<?php 	$m_scrp = get_template_directory_uri() . '/includes/timthumb.php?';
                    	$m_image = '';
                    	$customfields = get_post_custom();  if (empty($customfields['image'][0])) {
$m_image = m_theme_capture_first_image(); } else { $m_image = $customfields['image'][0]; } if (empty($m_image)) { $imgpath = $m_image_def;  	} else {
$imgpath = $m_scrp . 'src=' . $m_image . '&w=' . 418 . '&h=' . 215 . '&zc=1'; } ?>
  <a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link to <?php the_title_attribute(); ?>">
  <img src="<?php echo $imgpath; ?>" alt="" /> </a>
 <?php endif?>
	    <?php the_content_limit('200'); ?>
        <div id="featbig-author"><?php _e("by", "nt"); ?> <a href="<?php echo get_author_posts_url( get_the_author_meta( 'ID' ) ); ?>" title="<?php printf( esc_attr__( 'View all posts by %s'), get_the_author() ); ?>"><?php the_author(); ?></a> | <?php _e("Published", "nt"); ?> <?php echo human_time_diff(get_the_time('U'), current_time('timestamp')) . ' '; ?><?php _e("ago", "nt"); ?></div>
		 <?php endwhile; ?>	<?php else : ?> 	<?php endif; ?>
       <div id="featsmall">
       <?php query_posts('showposts=2&cat='.get_option('mainnewscat').'&offset=4'); if (have_posts()) : ?><?php while (have_posts()) : the_post(); ?>
            	<h2><a href="<?php the_permalink() ?>" rel="bookmark"><?php the_title(); ?></a></h2>
		 <?php endwhile; ?>	<?php else : ?> 	<?php endif; ?>
       </div>
       <div class="cb"></div>
		</div>
		 </div>

I’d want optional sticky posts only for “featbig” class.

Can anybody help me? Thank you very much!