text:     var login_form = document.getElementById('login_form');
      var f_user = document.getElementById('f_user');
      var f_pass = document.getElementById('f_pass');
      f_user.onkeydown = function(e) {
        if (e.keyCode == 13) {
          f_pass.focus();
          return false;
        }
      }
      f_pass.onkeydown = function(e) {
        if (e.keyCode == 13) {
          login_form.submit();
          return false;
        }
      }
      f_user.focus();
  
  