function swapValues(el1, el2)
{
  var t = el1.value; el1.value = el2.value; el2.value = t;
}

function jumpTo(name)
{
  var el = document.loginform.elements[name];
  if (el != null && el.value == "") {
    el.focus();
    return true;
  }
  return false;
}

function onEnter()
{
  // if all input fields are filled, submit the form;
  // otherwise jump to a next empty input field
  (typeof jumpToFirstEmptyInputField == "function" &&
   jumpToFirstEmptyInputField()) ||
  (typeof document.loginform == "object" &&
   document.loginform.submit());
}

function focusIn(el)
{
  if (el != null && !el.disabled)
    el.style.backgroundColor = "#FFF09E";
}

function focusOut(el)
{
  if (el != null && !el.disabled)
    el.style.backgroundColor = "";
}

function pair(name, value)
{
  return {'name':name, 'value':value};
}

function submit(arr, allow_empty_fields)
{
  for (var i in arr) {
    var el = arr[i];
    if (document.loginform.elements[el.name] != null)
      document.loginform.elements[el.name].value = el.value;
  }

  if (typeof allow_empty_fields == "undefined" ||
      allow_empty_fields == false)
    return onEnter();

  return document.loginform.submit();
}

function submitOkCode(value, allow_empty_fields)
{
  return submit([pair('~okcode', value)], allow_empty_fields);
}