title: how to show products at magento homepage
body: <p>i'm new at magento. I want to show a list of products in magento frontend with attributes such as color, size, quantity and add to cart option but the the front page show me the bellow message...</p>
  
  <p>There are no products matching the selection.</p>
  
  <p>i used in homepage editor the bellow code:</p>
  
  <pre><code>{{block type="catalog/product_list" category_id="3" template="catalog/product/list.phtml"}}
  </code></pre>