title: How to add a block in checkout page in Magento
body: <p>I need to add a block on magento default checkout page i.e in <strong>cart.phtml</strong> file.
     So first step I did  is, I added a block of code in checkout.xml file in the section</p>
  
  <pre><code>     &lt;reference name="content"&gt;
        &lt;block type="checkout/cart" name="checkout.cart"&gt; .....
  </code></pre>
  
  <p>Here is my code</p>
  
  <pre><code>     &lt;block type="bestseller/bestseller" name="bestseller" template="bestseller/bestseller.phtml"/&gt;
  </code></pre>
  
  <p>and then in second step i just called its child html section as</p>
  
  <pre><code>      &lt;div style="width:220px; float:right;"&gt;&lt;?php echo $this-&gt;getChildHtml('bestseller');?&gt;   &lt;/div&gt;
  </code></pre>
  
  <p>But the problem is when I came to see its frontend I seen this bestseller block is appearing two times on the same checkout page.
  I don't know what m doing wrong. !!pLease someone help me !</p>