<?php 
      $i=0; // Initialize to Zero;
      if (have_posts()) : 
        while (have_posts()) : the_post();
            if ($i==0) {$recentpostid = $post->ID; $i=$i+1;} 
        endwhile; 
      endif;
      //get only the latest post
      $posts = query_posts( 'p='.$recentpostid."'");
?>