Dual Loop Final

    <?php
    // First query
    $my_query = new WP_Query;
    $my_query->query( array( 'numberposts' => '6' ) );

    // If first query have posts
    if( $my_query->have_posts() ) :

        $count = 0;

        // While first query have posts
        while ($my_query->have_posts()) : $my_query->the_post();

            // Setup vars
            $count++;
            $incr_number = get_post_meta( $post->ID,'incr_number',true);
        ?>

        <!-- start post -->

FIRST GROUP OF POSTS CODE

         <!-- end post -->

            <?php

            // If count is equal to 6
            if($count % 6 ==0  && $count !=0) :

                                // Second query
                                $my_second_query = new WP_Query;
                                $my_second_query->query('offset='.$myOffset.'&showposts=6');

                                // If second query have posts
                                if( $my_second_query->have_posts() ) :

                                        // While second query have posts
                                        while( $my_second_query->have_posts() ) : $my_second_query->the_post(); $myOffset++; ?>

        <!-- start post -->

SECOND GROUP OF POSTS CODE

         <!-- end post -->

        <?php endwhile; ?>

                <?php
                // End if second query have posts
                endif; ?>

                <?php
                // End if second query have posts
                endif; ?>

        <?php
        // End first while have posts
        endwhile; ?>

    <?php
    // End if first query have posts
    endif; ?>