title: how to add additioanla parameter in referral URL in Magento
body: <p>I want to add additional parameter in referral URL. in Magento when I add item to compare list, it successfully added and then it redirect to referral URL. while going back to referral URL i want to add some additional parameters in the URL.</p>
  
  <p>$this->_redirectReferer(); if i call the function it redirects the previous page. for example it redirects to <a href="http://magento.com/product.html" rel="nofollow">http://magento.com/product.html</a></p>
  
  <p>instead of this i want to redirect to <a href="http://magento.com/product.phtml/?timestamp" rel="nofollow">http://magento.com/product.phtml/?timestamp</a></p>
  
  <p>basically i want to add some additional parameter in my referral URL.</p>