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;