On the bottom of product info page. there is a webpage url, I want to put this url code out,but when I try to use the code as:

<a href="' . zen_href_link(FILENAME_REDIRECT,zen_get_all_get_params(array('action')) . 'action=url&goto=' . urlencode($products_url), ">' .TEXT_MORE_INFORMATION . '</a>

it can not work,,Does anyone could advise how to make this code work in correct.and I also want to know what is the url code of "tell a friend","wirte review"...