var timeout    = 1000;
var closetimer = 0;
var menuitem = 0;

function drop()
{  canceltimer();
   close();
   menuitem = $(this).find('ul').css('visibility', 'visible');}

function close()
{  if(menuitem) menuitem.css('visibility', 'hidden');}

function timer()
{  closetimer = window.setTimeout(close, timeout);}

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

$(document).ready(function()
{
	$('#menu > li').bind('mouseover', drop)
	$('#menu > li').bind('mouseout',  timer)
});

document.onclick = close;