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

function menu_open()
{ menu_canceltimer();
  menu_close();
  ddmenuitem = jQuery(this).find('ul').eq(0).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;}}

jQuery(document).ready(function()
{ jQuery('#menu > li').bind('mouseover', menu_open);
  jQuery('#menu > li').bind('mouseout',  menu_timer);});

document.onclick = menu_close;