var closetimer = null;
var $activeitem = null;

function menu_open(){
  menu_canceltimer();
  menu_close();
  $activeitem = $(this).css({ 'overflow': 'visible' });
}
function menu_close(){
  if($activeitem){
    $activeitem.css({ 'overflow': 'hidden' });
  }
}
function menu_timer(){
  closetimer = window.setTimeout(menu_close, 500);
}
function menu_canceltimer(){
  if(closetimer){
    window.clearTimeout(closetimer);
    closetimer = null;
  }
}