var is_submitted = false;
       
    function moveQ(i_start,is_valid){
      // is_valid now indicate that the previous button has been clicked.  C Donaldson, 2004-08-20.
      if (is_valid != true ) { is_valid = check_req_list() }
      if (is_valid==true) {
        if (is_submitted==false) {
          document.f1.fPage.value = i_start;
          is_submitted = true;
          document.f1.submit();
        } else {
          alert("You\'ve already submitted your changes.\n Please refresh the page if you need to re-submit.");
        }
      }
      return false;
    }