Question

I have already read some info about his issue on the web, but I had no serious solution.
Resources I read:
http://codex.wordpress.org/The_Loop#Multiple_Loops_in_Action

http://wordpress.org/support/topic/next_posts_link-not-displays-same-posts-not-next-posts-when-using-offset – Exactly the same problem.

Now here is my code in index.php:

<!--slider-->
<div id="featured"> 
            <?php 
                // query the posts of your custom post types
                query_posts('posts_per_page=5');
                if (have_posts()) : while (have_posts()) : the_post(); ?>

<!--main body-->
    <?php 
                // query the posts of your custom post types
                query_posts('posts_per_page=5&offset=5');
                if (have_posts()) : while (have_posts()) : the_post(); ?>

When I press the next posts I get the same duplicates of the body posts.
What is the solution for this?

EDIT:
I have wrote new code:

// featured
$slider = new WP_Query(array('posts_per_page' => 5));
if ($slider->have_posts()) : while ($slider->have_posts()) : $slider->the_post();

//main:
    $p = get_query_var('paged');
                if($p >0){
                $main = new WP_Query(array('posts_per_page' => 5, 'paged'=>get_query_var('paged')));
                }else{
                $main = new WP_Query(array('posts_per_page' => 5, 'offset' => 5,'paged'=>get_query_var('paged')));
                }
                if ($main->have_posts()) : while ($main->have_posts()) : $main->the_post();

//navigation:

<div class="navigation" >
    <div class="next-posts"><div class="nextBtn2"><?php previous_posts_link(); ?></div></div>
    <div class="prev-posts"><?php next_posts_link(); ?></div>
</div>

Answer 1

You should WP_Query for secondary loop (the featured) and use query_posts for the main body.
It works 95%
it will break on the last page because it will try to get the (very)last 5 items but those 5 will be in the offset. 🙁
So on the second last page you would need to hide the ‘next page’ pagination….

$featured = new WP_Query(array('posts_per_page' => 5));
if ($featured->have_posts()) : while ($featured->have_posts()) :
    $featured->the_post();

//shouldn't be needed if u use only one query_posts but it won't hurt
wp_reset_query();

$paged = get_query_var('paged');
$wanted_offset = 5;
// page zero won't need a hack
if ($paged != 0 ) {
    $post_per_page = 3;
    //$paged -1 because there is no page 1, just 0 and 2
    $offset = ($paged-1) * $post_per_page + get_query_var('posts_per_page');
} else {
    $offset = get_query_var('posts_per_page');    
}
query_posts('offset=' . $offset);
if (have_posts()) : while (have_posts()) : the_post();

Let me know if it works for you too.