// Taken from
http://javascript-array.com/scripts/jquery_simple_drop_down_menu/                                                                                 

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;
    }
}

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

document.onclick = jsddm_close;