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Always display parent 1 level down from home in atonav template

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Hi There,

I'm trying to create a nested subnav that always displays the uppermost parent, 1 level down from the home page.

I've modified the built-in template and can display the parent but am looking for a way to travel up the tree to discover the ultimate parent - if that makes sense?

Here is the start of my template with the code to display the parent commented in:
<!-- sub navigation -->
<ul class="s-nav">
   <?php  defined('C5_EXECUTE') or die("Access Denied.");
      $aBlocks = $controller->generateNav();
      $c = Page::getCurrentPage();
      $containsPages = false;
      $nh = Loader::helper('navigation');
      // start always display parent
      $title = $c->getCollectionName();
      $parentPageId = $c->getCollectionParentID();
      if ($parentPageId > 0) {
            $parentPage = Page::getById($parentPageId);
            $title = $parentPage->getCollectionName();
            $url = View::URL($parentPage->getCollectionPath());         
      }
Viewing 15 lines of 20 lines. View entire code block.


BTW, I don't know much php and have got this far by cobbling together stuff I've found on the forums.

Any help would be much appreciated.

Cheers

Ben