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<?php
  $nonav = '';
  $currentcategory = Mage::registry('current_category');
  $catid = $currentcategory->getId();
  if(!empty($catid)){
          $cur_category = Mage::getModel('catalog/category')->load($catid);
  } 
  if(!empty($cur_category)){
          $products = Mage::getResourceModel('catalog/product_collection')->addCategoryFilter($cur_category);
          Mage::getSingleton('catalog/product_status')->addVisibleFilterToCollection($products);
          Mage::getSingleton('catalog/product_visibility')->addVisibleInCatalogFilterToCollection($products);
  }
  if(!empty($products))
  {
      if($products->count() == false)
      {
          $nonav = "no-nav";
      }
  }
?>