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(){
                    $('#navbar > li').bind('mouseover', jsddm_open)
                    $('#navbar > li').bind('mouseout',  jsddm_timer)
                    });
                   
                    document.onclick = jsddm_close;