title: Display New Products, Filter by Category Ids: in Magento
body: <p>i have magento 1.5 and i want to display new products Filter by Category Ids. I had try by <code>-&gt;addCategoryFilter($categoryId);</code>
   But not working...</p>
  
  <p>I also try <a href="http://blog.chapagain.com.np/magento-how-to-filter-product-collection-using-2-or-more-category-filters/" rel="nofollow">this</a> tips, which exactly i want by (Category ids). but it give me error of: "Invalid attribute Category_ids"...</p>
  
  <p>SO can any one display new products in magento by list of Category ids....?</p>