How to add a link of external Suitelet page in advanced pdf

<table align="center" border="1" cellpadding="1" cellspacing="2" style="width:100%;"><tr>
<td align="center">
<#if record.custbody_jj_ack_status == "">
      <a href ="https://687719-sb1.extforms.netsuite.com/app/site/hosting/scriptlet.nl?
script=1688&amp;deploy=1&amp;compid=687719_SB1&amp;h=ef785bf6da90d5429f25&amp;poid=${record.id}">PLEASE CLICK HERE TO ACKNOWLEDGE THIS PURCHASE ORDER   </a>
<#else><p><b>
   This Purchase Order is already Acknowledged.
  </b></p>
</#if>
   </td>
</tr>
  </table>