<script type="text/javascript" charset="utf-8">  
  $(document).ready(function() {
 
    var thisQuestion = $('#question{QID}');
    var emailQuestion = $(thisQuestion).nextAll('.text-short:eq(0)');
 
    // Hide the email address question
    $(emailQuestion).hide();
 
    // Listener on the dropdown
    $('select', thisQuestion).change(function(event) {
 
      // Define the email address
      var emailAddress = '';
      switch($(this).val()) {
 /* 
                                case 'A1' :
          emailAddress = '';
          break;
        case 'A2' :
          emailAddress = '';
          break;
                                case 'A3' :
          emailAddress = '';
          break;
        case 'A4' :
          emailAddress = '';
          break;
*/
        case 'A5' :
          emailAddress = 'user@example.com';
          break;
 
      }
 
      // Load the hidden email question
      $('input.text', emailQuestion).val(emailAddress);
    });
  });
</script>

{if(QCODE=="A5","youremail@example.org","")}