function savePreferences(sender) {
   $("mainForm").submit();

   return false;
}

function _setupEvents(enable) {
  var widgets = [ "timezone", "shortDateFormat", "longDateFormat",
		  "timeFormat", "weekStartDay", "dayStartTime", "dayEndTime",
		  "firstWeek", "messageCheck" ];
  for (var i = 0; i < widgets.length; i++) {
    var widget = $(widgets[i]);
    if (enable)
      widget.observe("change", onChoiceChanged);
    else
      widget.stopObserving("change", onChoiceChanged);
  }
}

function onChoiceChanged(event) {
  var hasChanged = $("hasChanged");
  hasChanged.value = "1";

  _setupEvents(false);
}

function initPreferences() {
  _setupEvents(true);
  if (typeof (initAdditionalPreferences) != "undefined")
    initAdditionalPreferences();
}

FastInit.addOnLoad(initPreferences);