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I need to add possibility in Layered Navigation to filter by two categories. Can you give me a hint what should I change?

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Since nobody answer my question, I post my solution. It's working as I wanted, but I am not shure if it's good enough, so please correct me, if there is better solution.

So when I on category page I already have first category id in 'id' parameter and also I pass another GET parameter 'cat' with second category id.

First I extended Mage_Catalog_CategoryController where I save my category ids to the Registry

include_once("Mage/Catalog/controllers/CategoryController.php");
class My_CustomModule_Catalog_CategoryController extends Mage_Catalog_CategoryController
{
  protected function _initCatagory()
  { 
     $categoryId = (int) $this->getRequest()->getParam('id', false);
     Mage::register('first_category', $categoryId);
     $cat_param = (int) $this->getRequest()->getParam('cat', false);
     if($cat_param)  Mage::register('second_category', $cat_param);
     return parent::_initCatagory();
  }
}

Then I use catalog_product_collection_apply_limitations_after event for calling function addDoubleCategoriesHandle() from my Observer.php. Here I replace original join "cat_index" part - with two "joins" for both of my categories. And dont forget to replace cat_index on cat_index2 in second "joinCondition" to avoid sql errors.

class My_CustomModule_Model_Observer {    
  public function addDoubleCategoriesHandle(Varien_Event_Observer $observer) {
    $collection = $observer->getEvent()->getCollection();
    $fromPart = $collection->getSelect()->getPart(Zend_Db_Select::FROM);
    if (isset($fromPart['cat_index']) && (Mage::registry('first_category')) && (Mage::registry('second_category'))) {
        $pattern = "/cat_index.category_id = '\d+'/";
        $replacement = "(cat_index.category_id = '".Mage::registry('first_category')."')";
        $first_cat_join = preg_replace($pattern, $replacement, $fromPart['cat_index']['joinCondition']);
        $replacement2 = "(cat_index2.category_id = '".Mage::registry('second_category')."')";
        $second_cat_join = preg_replace($pattern, $replacement2, $fromPart['cat_index']['joinCondition']);
        $second_cat_join = str_replace('cat_index.','cat_index2.',$second_cat_join);
        $fromPart['cat_index']['joinCondition'] = $first_cat_join;
        $fromPart['cat_index2'] =  $fromPart['cat_index'];
        $fromPart['cat_index2']['joinCondition'] = $second_cat_join;
        $collection->getSelect()->setPart(Zend_Db_Select::FROM, $fromPart);

    }
   }
  }

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