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