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

function jsddm_open()
{
   jsddm_canceltimer();
   jsddm_close();
   ddmenuitem = $(this).find('ul').css('visibility', 'visible');
}

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;
   }
}
$('#jsddm > li').bind('mouseover', jsddm_open)
$('#jsddm > li').bind('mouseout',  jsddm_timer)
$('#menu_vertical > li').bind('mouseover', jsddm_open)
$('#menu_vertical > li').bind('mouseout',  jsddm_timer)

document.onclick = jsddm_close;