$(document).ready(function() {    
 
  // Define the new message
  var newMessage = 'We are sorry but you are not allowed to enter this survey.<br><br>\
            This invitation has already been used.<br><br>\
            It looks as though you’ve recently completed the survey and provided your feedback. Unfortunately, we’re only able to accept one survey per applicant.';
 
  // Insert the new message (only if the token form is missing)
  if($('#tokenmessage').length > 0 &amp;&amp; $('#tokenform').length == 0) {
    $('#tokenmessage').html(newMessage);
  }
 
});