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========== index.php ==========
$menu_name = 'primary';
if ( ( $locations = get_nav_menu_locations() ) && isset( $locations[ $menu_name ] )) {
    $menu = wp_get_nav_menu_object( $locations[ $menu_name ] );
    $menu_items = wp_get_nav_menu_items($menu->term_id);
}
foreach ( $menu_items as $menu_item ) {
    $numbers[] = get_post_meta( $menu_item->ID, '_menu_item_object_id', true );
}
for ($i=0; $i < count($numbers); $i++) {
	$id = $numbers[$i];
	$post = get_post($id);
	$content = apply_filters('the_content', $post->post_content);
	echo '<div class="wpis section fp-section-'.$i.'">';
	echo '<div class="dupa">';
	echo '<h1 class="pagetitle the_post the_page page-'.$id.'">'.get_the_title($id).'</h1>';
	echo '<div class="content"><p>'.$content.'</p></div>';
	echo '</div>';
	echo '</div>';
	if (strpos($content,'<p class="wp-more-tag mce-wp-more"') !== false) {
  		echo '<div id="popup">';
  		echo $content;
  		echo '<a href="#" class="more-link-close">Back to home</a>';
  		echo '</div>';

		} else {

	}

}

========== skrypty jquery ==========
<script type="text/javascript">
$( ".more-link" ).click(function() {
	$( "#popup" ).fadeToggle( "slow","linear", function() {
// Animation complete.
	});
});
$( ".more-link-close" ).click(function() {
	$( "#popup" ).fadeToggle( "slow","linear", function() {
// Animation complete.
	});
});


========== CSS ==========
#popup {padding:20px;height:90%;background-color: #ccc; margin: 0 auto; position: fixed; display: none; top:0; left: 20%; overflow: auto; z-index: 99}
#popup .wp-more-tag {display:none;}