var timeout    = 500;
var closetimer = 0;
var ddmenuitem = 0;
var mainMenu = '.menu';
var subMenu = '.menu2';

function jsddm_open()
{  jsddm_canceltimer();
   jsddm_close();                
   ddmenuitem = $(this).find('ul').css('visibility', 'visible');
   var mM = $(this);
   $(subMenu).css({
       'top': mM.height()+mM.position().top
   });
}

function jsddm_close()
{  if(ddmenuitem) ddmenuitem.css('visibility', 'hidden');}

function jsddm_timer()
{  closetimer = window.setTimeout(jsddm_close, timeout);}

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

$(document).ready(function()
{  $(mainMenu+' > li').bind('mouseover', jsddm_open)
   $(mainMenu+' > li').bind('mouseout',  jsddm_timer)});

document.onclick = jsddm_close;