var timeout = 50;
var closetimer = 0;
var ddmenuitem = 0;

function menu_open()
{
  menu_canceltimer();
  menu_close();
  
  ddmenuitem = $(this).find('ul');
  ddmenuitem.css('display', 'block');
}

function menu_close()
{
  if (ddmenuitem) 
  {
    ddmenuitem.css('display', 'none');
    //ddmenuitem.slideUp('fast');
  }
}

function menu_timer()
{
  closetimer = window.setTimeout(menu_close, timeout); 
}

function menu_canceltimer()
{
  if (closetimer)
  {
    window.clearTimeout(closetimer);
    closetimer = null;
  }
}

$(document).ready(function () {
  $('.topnav > li').bind('mouseover', menu_open)
  $('.topnav > li').bind('mouseout', menu_timer)
});