var timeout    = 500;
var closetimer = 0;
var ddmenuitem = 0;

function topnavlist_open()
{  $(document).bind("click",function() {
	topnavlist_close();
});
	topnavlist_canceltimer();
   topnavlist_close();
   ddmenuitem = $(this).find('ul').css('visibility', 'visible');
}

function topnavlist_close() {  
	if(ddmenuitem) ddmenuitem.css('visibility', 'hidden');
	$(document).unbind("click");
}

function topnavlist_timer()
{  closetimer = window.setTimeout(topnavlist_close, timeout);}

function topnavlist_canceltimer()
{  if(closetimer)
   {  window.clearTimeout(closetimer);
      closetimer = null;}}