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;