var timeout    = 500;
var closetimer = 0;
var ddmenuitem = 0;

function menu_open() {
  menu_canceltimer(); 
  menu_close();
  ddmenuitem = $(this).find('ul').css('visibility', 'visible');
}
function menu_close() {
    if (ddmenuitem) ddmenuitem.css('visibility', 'hidden');
}
function menu_timer() {
    closetimer = window.setTimeout(menu_close, timeout);
}
function menu_canceltimer() {
  if(closetimer) {
    window.clearTimeout(closetimer);
    closetimer = null;
  }
}